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The basic definition of Boneh is creating or assembling any kind of structure. In order to be culpable for Boneh, one need not even build the entire structure; even contributing to the building process can be enough to be culpable. The classic example of the av melacha of Boneh would be the construction of a permanent structure, like a house.<ref> Rav Eli Baruch Shulman highlighted a Rashi in Beitzah, 11b (s.v. d’ein binyan b’keilim) that says the reason that there is no binyan by keilim (according to Beis Hillel) is because Boneh applies only to binyan batim.  </ref> The amount of Boneh that one must do to be culpable is any amount.<ref> Mishnah, Shabbos 102b. The Gemara says this is learned from the Mishkan where they would fill up wormholes in the kerashim with melted lead. </ref>  
==Definition==
#  The basic definition of Boneh is creating or assembling any kind of structure. In order to be chayav for Boneh, one need not even build the entire structure; even contributing to the building process can be enough to be chayav. The classic example of the av melacha of Boneh would be the construction of a permanent structure, like a house.<ref> Rav Eli Baruch Shulman highlighted a Rashi in Beitzah, 11b (s.v. d’ein binyan b’keilim) that says the reason that there is no binyan by keilim (according to Beis Hillel) is because Boneh applies only to binyan batim.  </ref> # The amount of Boneh that one must do to be chayav is a kol shehu, any amount.<ref> Mishnah, Shabbos 102b. The Gemara says this is learned from the Mishkan where they would fill up wormholes in the kerashim with melted lead. </ref>


=== Two Primary Principles of Boneh ===
=== Two Primary Principles of Boneh ===
# Creating a shelter ("asiat ohel") <ref>Rambam 7,6 This was done in the Mishkan when the walls and rooftops were assembled. </ref>
# Creating a shelter ("asiat ohel") <ref>Rambam 7,6 This was done in the Mishkan when the walls and rooftops were assembled. </ref>
# Assembling pieces to create a form or structure ("me'dabek chalakim") <ref> Rambam 11,13 and 22,27 This was done in the Mishkan when the planks were assembled. </ref>
# Assembling pieces to create a form or structure ("me'dabek chalakim") <ref> Rambam 11,13 and 22,27 This was done in the Mishkan when the planks were assembled. </ref>
 
# Performing either of these actions constitutes a Torah-prohibition, as both of these actions were done in the construction of the Mishkan.  An action that involves both of these principles is the av melacha of Boneh.<ref>Rambam as explained by the Even Ha'ezel 10,17. For instance, Rambam Hilchos Shabbos 7:6 writes that making cheese on Shabbos is a violation of Boneh, as it involves combining pieces together to create a new object.</ref> Pitching a tent, even if it does not require assembly, would be asiyas ohel and a toldah of Boneh.<ref>  Rambam, Hilchos Shabbos, 10:13</ref>
Performing either of these actions constitutes a Torah-prohibition, as both of these actions were done in the construction of the Mishkan.  An action that involves both of these principles is the av melacha of Boneh. <ref>Rambam as explained by the Even Ha'ezel 10,17. For instance, Rambam Hilchos Shabbos 7:6 writes that making cheese on Shabbos is a violation of Boneh, as it involves combining pieces together to create a new object.</ref> Pitching a tent, even if it does not require assembly, would be asiyas ohel and a toldah of Boneh.<ref>  Rambam, Hilchos Shabbos, 10:13</ref>


===Building shelters and tents===
===Building shelters and tents===
# Setting up a functional installation attached to the ground is a violation of Boneh (building). For example, it's forbidden to erect a post in the ground or tomato stake to support a tomato plant. <ref>39 Melachos (Rabbi Ribiat, vol 4, pg 1005) </ref>  
# Setting up a functional installation attached to the ground is a violation of Boneh (building). For example, it's forbidden to erect a post in the ground or tomato stake to support a tomato plant.<ref>39 Melachos (Rabbi Ribiat, vol 4, pg 1005) </ref>  
# Laying bricks, setting up rocks as a border to a garden, putting down rocks for landscaping purposes (like chips around a tree or on a road or path), and building a fence are all violations of Boneh (building). <ref> 39 Melachos (Rabbi Ribiat, vol 4, pg 1006) </ref>  
# Laying bricks, setting up rocks as a border to a garden, putting down rocks for landscaping purposes (like chips around a tree or on a road or path), and building a fence are all violations of Boneh (building).<ref> 39 Melachos (Rabbi Ribiat, vol 4, pg 1006) </ref>  
# Building a [[Sukkah]] is forbidden as Boneh (building). <ref>39 Melachos (Rabbi Ribiat, vol 4, pg 1010) </ref>  
# Building a [[Sukkah]] is forbidden as Boneh (building).<ref>39 Melachos (Rabbi Ribiat, vol 4, pg 1010) </ref>  
# Building any functional land structure whether it is permanent or temporary is forbidden. <ref>39 Melachos (Rabbi Ribiat, vol 4, pg 1012) explains that if it is a construction that can't be taken apart and only can be broken then it's forbidden biblically whether it is permanent or temporary and if it is a assembly that can be dismantled then building it for temporary purposes (less than 7 days) is a rabbinic violation and building it for permanent purposes is biblical violations. </ref>  
# Building any functional land structure whether it is permanent or temporary is forbidden.<ref>39 Melachos (Rabbi Ribiat, vol 4, pg 1012) explains that if it is a construction that can't be taken apart and only can be broken then it's forbidden biblically whether it is permanent or temporary and if it is a assembly that can be dismantled then building it for temporary purposes (less than 7 days) is a rabbinic violation and building it for permanent purposes is biblical violations. </ref>  
# However, using an object as it is normally used such as closing a door is permitted. Similarly one may replace a removable paper towel roll or removable toilet paper holder. <ref>39 Melachos (Rabbi Ribiat, vol 4, pg 1014-5) </ref>  
# However, using an object as it is normally used such as closing a door is permitted. Similarly one may replace a removable paper towel roll or removable toilet paper holder.<ref>39 Melachos (Rabbi Ribiat, vol 4, pg 1014-5) </ref>  
===Adding on to a existing structure===
===Adding on to a existing structure===
# Just as it is forbidden to create even a temporary structure on [[Shabbat]], it is forbidden to add onto a permanent structure even if the addition is temporary.<ref>Kitzur S"A 80:67</ref>
# Just as it is forbidden to create even a temporary structure on [[Shabbat]], it is forbidden to add onto a permanent structure even if the addition is temporary.<ref>Kitzur Shulchan Aruch 80:67</ref>
# In previous centuries it was common to have dirt floors and it would be forbidden to put down new sand as it is left as a permanent layer of the floor and is a violation of Boneh (building). <ref>39 Melachos (Rabbi Ribiat, vol 4, pg 1015) </ref>   
# In previous centuries it was common to have dirt floors and it would be forbidden to put down new sand as it is left as a permanent layer of the floor and is a violation of Boneh (building).<ref>39 Melachos (Rabbi Ribiat, vol 4, pg 1015) </ref>   
# Putting down a large area rug which is meant to remain there for more than 7 days is forbidden as it is considered something that can become nullified to the floor. <ref>39 Melachos (Rabbi Ribiat, vol 4, pg 1017 and 1019) explains that since it is only a loose addition it doesn't become nullified to the floor unless it is put there for 7 days. </ref>  
# Putting down a large area rug which is meant to remain there for more than 7 days is forbidden as it is considered something that can become nullified to the floor.<ref>39 Melachos (Rabbi Ribiat, vol 4, pg 1017 and 1019) explains that since it is only a loose addition it doesn't become nullified to the floor unless it is put there for 7 days. See Dor Hamelaktim v. 4 p. 2040 who quotes Shabbos Home (Artscroll, p. 423) as being lenient unless the carpet is from wall to wall.</ref>  
# Tiling a floor, wallpapering a room, installing a doorknob are all forbidden as adding to an existing structure. <ref>39 Melachos (Rabbi Ribiat, vol 4, pg 1016-7) </ref>  
# Tiling a floor, wallpapering a room, installing a doorknob are all forbidden as adding to an existing structure.<ref>39 Melachos (Rabbi Ribiat, vol 4, pg 1016-7) </ref>  
# According to many poskim it is permitted to rehang a picture that fell on [[Shabbat]] as long as the picture isn't expensive and rare. <ref>39 Melachos (Rabbi Ribiat, vol 4, pg 1019) explains that that according to many opinions hanging a picture isn't a violation of adding to a existing structure because it retains it's own function similar to putting a potted plant on the floor or a vessel in the breakfront even though it will remain for a long time. On pg 1038 he writes that it's permissible to rehang it unless it is a expensive and rare painting because it would be [[muktzah]] and according to some poskim it's [[muktzeh]] once it was attached during the onset of [[Shabbat]]. </ref>  
# According to many poskim it is permitted to rehang a picture that fell on [[Shabbat]] as long as the picture isn't expensive and rare.<ref>39 Melachos (Rabbi Ribiat, vol 4, pg 1019) explains that that according to many opinions hanging a picture isn't a violation of adding to a existing structure because it retains it's own function similar to putting a potted plant on the floor or a vessel in the breakfront even though it will remain for a long time. On pg 1038 he writes that it's permissible to rehang it unless it is a expensive and rare painting because it would be [[muktzah]] and according to some poskim it's [[muktzeh]] once it was attached during the onset of [[Shabbat]]. </ref>  
# One should not replace a [[mezuzah]] that fell on [[Shabbat]] because of issues of adding to an existing structure and [[muktzeh]]. However, if it is [[lying]] on the floor one pick it up in a abnormal way such as by using the palms of both hands. <ref>39 Melachos (Rabbi Ribiat, vol 4, pg 1038) </ref>  
# One should not replace a [[mezuzah]] that fell on [[Shabbat]] because of issues of adding to an existing structure and [[muktzeh]]. However, if it is [[lying]] on the floor one pick it up in a abnormal way such as by using the palms of both hands.<ref>39 Melachos (Rabbi Ribiat, vol 4, pg 1038) </ref>
 
===Digging and filling a hole===
===Digging and filling a hole===
# When people used to have dirt floors, if there was a hole in the floor, filling it up would be a violation of Boneh. <reF>In Gemara ([[Shabbat]] 73b) Rava says that if one fills in a hole with dirt inside the house, one has violated Boneh. Rambam ([[Shabbat]] 10:12) rules that flattening the ground indoors, by flattening a mound or filling in a hole is a violation of Boneh. Mishna Brurah 337:6 writes that if one intentionally fills the holes when sweeping one would violate Boneh.</ref>
# When people used to have dirt floors, if there was a hole in the floor, filling it up would be a violation of Boneh. <reF>In Gemara ([[Shabbat]] 73b) Rava says that if one fills in a hole with dirt inside the house, one has violated Boneh. Rambam ([[Shabbat]] 10:12) rules that flattening the ground indoors, by flattening a mound or filling in a hole is a violation of Boneh. Mishna Brurah 337:6 writes that if one intentionally fills the holes when sweeping one would violate Boneh.</ref>


===Assembling objects===
===Assembling objects===
# One of the biggest limitations in the melacha of Boneh is its application to keilim, moveable vessels that are not attached to the ground. ''Ein binyan b’keilim'' is a concept that appears in several Gemaras<ref> Shabbos 102b, 122b and Beitzah 11b are some examples  </ref> and is the subject of an enormous machlokes<ref> It is well beyond the scope of this forum to discuss the magnitude of this topic. For further reading, the sefer Binyan Shabbos (Part 1) dedicates several chapters to this topic. </ref> among the rishonim, achronim, and poskim. Despite the all-encompassing implication of “ein binyan b’keilim,” most rishonim and poskim say that there are situations when one can make a kli and be chayav on a biblical level for Boneh. The general consensus among most rishonim is that Boneh does apply to keilim when one makes a kli in its entirety<ref> Chiddushei HaRamban, Shabbos 102b, s.v. Rav Amar. Also see Tosfos, Shabbos 74b, s.v. Chavisa  </ref> or if one uses strength and craft (''chizuk v’umanus'') in the process of making it.<ref> Tosfos, Shabbos 102b, s.v. Hai. It should be noted that Rashi (Shabbos 47a, s.v. Chayav Chatas; Beitza 11B, s.v. d’ein) seems to be of the opinion that there is no concept of binyan b’keilim at all. However, Rashi says (Shabbos 47a) that there are cases, like making a kli in its entirety, when one would be chayav for makeh b’patish. </ref>
# One of the biggest limitations in the melacha of Boneh is its application to keilim, moveable vessels that are not attached to the ground. ''Ein binyan b’keilim'' is a concept that appears in several Gemaras<ref> Shabbos 102b, 122b and Beitzah 11b are some examples  </ref> and is the subject of an enormous machlokes<ref> According to Rashi Shabbat 74b s.v. ve’iy there is no issue of boneh when constructing a utensil and only if it is attached to the ground is it boneh, altogether either way it’ll be macah b’patish. However, Tosfot s.v. chavita argues that creating a kli is also boneh as the gemara Shabbat 102b cites the opinion of Rav who holds that assembling a shovel is boneh. Maginei Shlomo Shabbat 102b answers Tosfot’s question based on the Ramban (Milchamot Shabbat 37a) who explains that many other amoraim disagree with Rav and hold that there's no boneh in constructing utensils. See Peni Yehoshua Shabbat 74b for another answer. Nonetheless, the conclusion of most rishonim is that it is boneh to create a utensil from scratch like Tosfot. This is the opinion of Baal Hameor (on Rif Shabbat 37a s.v. ayil), Ran (37a s.v. makshu), Ramban (102b s.v. rav), and Rashba (102b s.v. hay). For further reading, the sefer Binyan Shabbos (Part 1) dedicates several chapters to this topic. </ref> among the rishonim, achronim, and poskim. Despite the all-encompassing implication of “ein binyan b’keilim,” most rishonim and poskim say that there are situations when one can make a kli and be chayav on a biblical level for Boneh. The general consensus among most rishonim is that Boneh does apply to keilim when one makes a kli in its entirety<ref> Chiddushei HaRamban, Shabbos 102b, s.v. Rav Amar. Also see Tosfos, Shabbos 74b, s.v. Chavisa  </ref> or if one uses strength and craft (''chizuk v’umanus'') in the process of making it.<ref> Tosfos, Shabbos 102b, s.v. Hai. It should be noted that Rashi (Shabbos 47a, s.v. Chayav Chatas; Beitza 11b, s.v. d’ein) seems to be of the opinion that there is no concept of binyan b’keilim at all. However, Rashi says (Shabbos 47a) that there are cases, like making a kli in its entirety, when one would be chayav for makeh b’patish. </ref>
# Making an earth vessel such as an oven or barrel before it is hardened in the kiln is a violation of Boneh. <ref>Rambam ([[Shabbat]] 10:13)</ref>
# Making a utensil loosely is permitted if it usually is made loosely, but it is forbidden to fit it together tightly or even loosely if it usually fits together tightly.<ref>The Gemara Shabbat 47a cites a dispute whether constructing a bed in a loose fashion is permitted but everyone agrees if it is tight it is forbidden. The Shulchan Aruch 313:6 rules that if it is loose it is permitted. Rama 313:6 writes that it is only permitted to assemble a utensil in a loose fashion if it is normally loose, however, if it is usually tight and you just made it loose once there is a concern you'll make it tight this time. The Bet Yosef cites this concept from the Hagahot Ashuri Shabbat 3:23 and infers it from the Rambam 22:26.</ref> For example, constructing an army cot from pieces that come apart on Shabbat or Yom Tov is forbidden since the legs fight in tightly.
# One shouldn't untangle [[Tzitzit]] strings on [[Shabbat]] because this involves Tikkun Kli (fixing of a vessel). <ref>Shemirat [[Shabbat]] Kehilchata 15:94</ref>
## If a shtender is made of multiple pieces it is forbidden to construct or reassemble if it is apart unless it is so loose that the pieces would wobble in their sockets.<ref>Shulchan Aruch 313:6 cites a dispute whether constructing a cup is similar to constructing a bed. Mishna Brurah 313:45 explains the dispute is whether a cup which is which put together tightly but not hammered together is judged like a bed or not. Mishna Brurah 313:46 writes that initially we are strict to assume that it is the same halacha as a bed but if there's a need of Shabbat we are lenient. Lastly, Mishna Brurah 313:47 equates a shtender made of pieces to a cup. Shulchan Aruch 313:6 only permits constructing a bed if it is loose. Biur Halacha 313:6 s.v. darka cites the Raavad who explains that loose means that it is so loose that it would wobble in its socket.</ref>
# One shouldn't make a paper boat or paper hat by folding the paper since this involves creating a vessel. <ref>Shemirat [[Shabbat]] Kehilchata 16:21</ref>
# Covering a pot with a cover tightly is permitted since it is meant to be opened and closed all the time.<Ref>Mishna Brurah 313:45</ref>
# One may fold a napkin regularly, but one shouldn't fold it in a special shape, such as is normally done in honor of guests. <ref>Shemirat [[Shabbat]] Kehilchata 28:17</ref>
# A shtender which can have its height adjusted with a knob but isn't frequently adjusted, according to many poskim it is permitted to adjust the height on Shabbat, and according to others it is forbidden.<ref>Rav Shlomo Zalman Auerbach in Meor HaShabbat (v. 2 Letter 32:3) holds that it is permitted to adjust the height of a shtender with a knob which tightens and loosens, even if it is only infrequently adjusted, since the shtender is like covering and uncovering a pot, which was a utensil before and after the use. However, Minchat Yitzchak 9:38 disagrees since the shtender is only infrequently adjusted unlike a pot cover. See Dirshu (Mishna Brurah 313:45) and [http://ph.yhb.org.il/01-15-06/ Peninei Halacha Shabbat 15:6].</ref>
# Making an earth vessel such as an oven or barrel before it is hardened in the kiln is a violation of Boneh.<ref>Rambam ([[Shabbat]] 10:13)</ref>
# One shouldn't untangle [[Tzitzit]] strings on [[Shabbat]] because this involves Tikkun Kli (fixing of a vessel).<ref>Shemirat Shabbat Kehilchata 15:94</ref>
# One shouldn't make a paper boat or paper hat by folding the paper since this involves creating a vessel.<ref>Shemirat Shabbat Kehilchata 16:21</ref>
# One may fold a napkin regularly, but one shouldn't fold it in a special shape, such as is normally done in honor of guests.<ref>Shemirat Shabbat Kehilchata 28:17</ref> Some are lenient.<reF>Rivevot Efraim 1:223:8 quoting Rav Moshe Feinstein. See also Dor Hamelaktim v. 2 p. 1214 for more opinions.</ref>
 
==In the Mishkan==
==In the Mishkan==
# The melacha of Boneh was done in the Mishkan when they placed the kerashim, the planks that made up the walls, into their sockets.<ref> Yerushalmi Shabbos, 7th and 12th Perek </ref>
# The melacha of Boneh was done in the Mishkan when they placed the kerashim, the planks that made up the walls, into their sockets.<ref> Yerushalmi Shabbos, 7th and 12th Perek </ref>
==Building a tent==
==Building a Tent==
# It’s forbidden to set up the roof of a tent, permanent or temporary, on [[Shabbat]], even if one there are no walls. Additionally, it’s forbidden to add onto a tent structure, however, a temporary addition to an existing structure is permitted. <Ref>Shemirat [[Shabbat]] KeHilchata 24:1-2 </ref>
# It is forbidden to set up the roof of a tent, permanent or temporary, on [[Shabbat]], even if one there are no walls. Additionally, it’s forbidden to add onto a tent structure, however, a temporary addition to an existing structure is permitted.<Ref>Shemirat Shabbat KeHilchata 24:1-2 </ref>
# It is forbidden to set up a tent out of blankets even if it is meant to be temporary. <Ref>Menuchat Ahava (vol 3, 23:8), Shemirat [[Shabbat]] KeHilchata 24:1-2 </ref>
# It is forbidden to set up a tent out of blankets even if it is meant to be temporary.<Ref>Menuchat Ahava (vol 3, 23:8), Shemirat Shabbat KeHilchata 24:1-2 </ref>
===Adding an existing structure===
===Adding an existing structure===
# It’s permitted to make a temporary addition to an exisiting tent. Therefore, if there is a [[Tefach]] of roof already opened before [[Shabbat]] one may continue to add a temporary addition to that roof, but one should only add to the existing roof starting from the side which is already roofed. <Ref>Shemirat [[Shabbat]] KeHilchata 24:6 </ref>
# It’s permitted to make a temporary addition to an existing tent. Therefore, if there is a [[Tefach]] of roof already opened before [[Shabbat]] one may continue to add a temporary addition to that roof, but one should only add to the existing roof starting from the side which is already roofed. <Ref>Shemirat Shabbat KeHilchata 24:6 </ref>
# One may not put a mat on top of polls or walls even if the mat is rolled up if there is a [[Tefach]] of width to the roll of the mat. Even if the rolled mat was put there before [[Shabbat]] one may not unroll it on [[Shabbat]], however, if a [[Tefach]] of the mat was already unrolled then it is permitted to continue to unroll it on [[Shabbat]]. <ref>Shemirat [[Shabbat]] KeHilchata 24:5, 7 </ref>
# One may not put a mat on top of polls or walls even if the mat is rolled up if there is a [[Tefach]] of width to the roll of the mat. Even if the rolled mat was put there before [[Shabbat]] one may not unroll it on [[Shabbat]], however, if a [[Tefach]] of the mat was already unrolled then it is permitted to continue to unroll it on [[Shabbat]].<ref>Shemirat Shabbat KeHilchata 24:5, 7 </ref>
===Roof which is attached===
===Roof Which is Attached===
# If a roof was attached before [[Shabbat]] with hinges or another permanent connection it is permitted to spread out that roof (which was attached) on [[Shabbat]]. <Ref>Shemirat [[Shabbat]] KeHilchata 24:13 </ref>
# If a roof was attached before [[Shabbat]] with hinges or another permanent connection it is permitted to spread out that roof (which was attached) on [[Shabbat]].<Ref>Shemirat Shabbat KeHilchata 24:13 </ref>
# It is permitted to open the hood of a baby carriage if it was attached from before [[Shabbat]], however, it was attached on [[Shabbat]] one may not spread it one [[Shabbat]]. Once the hood is open it is permitted to add a temporary additional roof but one should start to add to that roof from the side which is already covered (by the hood). <Ref>Shemirat [[Shabbat]] KeHilchata 24:13 </ref>
{{Stroller Hood on Shabbat}}
 
==Practical Examples of Building==
===Folding table===
# It is permitted to open a folding table.<Ref>Shemirat Shabbat KeHilchata 24:23 </ref>
# It’s permitted to add a table leaf to extend a table on [[Shabbat]] for temporary use,<ref>Shemirat Shabbat KeHilchata 24:23, Rivivot Ephraim 1:222:3, Practical Laws of [[Shabbat]] (Rabbi Rafeal Soae, vol 2, pg 146). Rav Elyashiv (Ashrei Haish 2:18:17) writes that it is permitted in a case of great need, otherwise it should be extended before Shabbat. Chazon Ovadia (v. 5, p. 315) writes that it is permitted to add a leaf to a table and it doesn’t involve constructing an ohel, since part of the ohel was already in place (and it is temporary). </ref> however, one should not take it apart on Shabbat unless one needs the space on that [[Shabbat]].
# One should not remove a drawer from a table if there’s a depth of a [[Tefach]] in the drawer, however, it is permitted to remove a drawer from a dresser because even after removing the drawer there still remains a roofed structure in the dresser.<Ref>Shemirat Shabbat KeHilchata 24:24 (and note 85) </ref>
# It is permitted to spread a tablecloth even if it hangs over the side of the table. <Ref>Mishna Brurah 315:31, Shemirat Shabbat KeHilchata 24:25 </ref>
 
===Umbrella===
===Umbrella===
# The Rabbis forbad opening and closing an umbrella on [[Shabbat]]. Furthermore, they forbad using an umbrella that’s already opened from before [[Shabbat]]. <Ref>Shemirat [[Shabbat]] KeHilchata 24:15, Biur Halacha 315:7, Ben Ish Chai (second year Shemot #8), Noda Biyehuda 1:30, [https://www.dailyhalacha.com/Display.asp?ClipDate=3/25/2008 Rabbi Eli Mansour], Rivevot Ephraim 7:105 and 2:115:61. see however Chatam Sofer OC 72 who is lenient </ref>  
# The Rabbis forbade opening and closing an umbrella on [[Shabbat]]. Furthermore, they forbade using an umbrella that’s already opened from before [[Shabbat]]. <Ref>Shemirat Shabbat KeHilchata 24:15, Biur Halacha 315:7, Ben Ish Chai (second year Shemot #8), Noda Biyehuda 1:30, [https://www.dailyhalacha.com/Display.asp?ClipDate=3/25/2008 Rabbi Eli Mansour], Rivevot Ephraim 7:105 and 2:115:61. see however Chatam Sofer OC 72 who is lenient </ref>  
# An umbrella is [[muktzeh]] since it cannot be used <ref> Shemirat [[Shabbat]] KeHilchata 24:15 </ref>
# An umbrella is [[muktzeh]] since it cannot be used <ref> Shemirat Shabbat KeHilchata 24:15 </ref>
 
===Binoculars===
See [[Balls_and_games#Binoculars_and_Telescopes | Binoculars and Telescopes]] on the [[Games on Shabbat]] page


==Binoculars==
===Setting up a Mechitza===
see [[Balls_and_games#Binoculars_and_Telescopes | Binoculars and Telescopes]] on the [[Games on Shabbat]] page
# It’s permissible to set up a partition as a mechitzah in shul between men and women on [[Shabbat]].<ref>Yalkut Yosef (vol 2, 315, pg 531), Rav Soloveitchik (cited in Nefesh Harav pg. 170), [https://www.yutorah.org/sidebar/lecture.cfm/857702/rabbi-hershel-schachter/highlights-of-melachos-shabbos-ii/ Rav Schachter (Highlights of Melachos Shabbat Part 2, min 62)] </ref>


==Mechitza==
===Saltshakers===
# It’s permissible to set up a partition as a mechitzah in shul between men and women on [[Shabbat]]. <ref>Yalkut Yosef (vol 2, 315, pg 531) </ref>
# It is permitted to open and close a saltshaker on [[Shabbat]].<ref> Minchat Shlomo 1:11:4 says that this isn't an issue of boneh since it isn't typically screwed on tightly. </ref>  


==Saltshakers==
===Pot covers===
# It is permitted to open and close a saltshaker on [[Shabbat]]. <ref> Minchat Shlomo 1:11:4 says that this isn't an issue of boneh since it isn't typically screwed on tightly. </ref>  
#It is permitted to cover or remove the cover on a pot on [[Shabbat]].<ref>Yalkut Yosef (pg 506) </ref> Some say that one may not cover a pot which is larger than 40 [[seah]].<Ref>Or Letzion (vol 2, chap 28:5) </ref>


==Pot covers==
===Glasses===
It is permitted to cover or remove the cover on a pot on [[Shabbat]]. <ref>Yalkut Yosef (pg 506) </ref> Some say that one may not cover a pot which is larger than 40 seah. <Ref>Or Letzion (vol 2, chap 28:5) </ref>
# Some poskim permit a glasses lenses to be replaced by a non-professional <ref>Yalkut Yosef (pg 512) </ref> while others forbid. <Ref>Shemirat Shabbat KeHilchata 15:77 </ref>  
==Glasses==
 
# Some poskim permit a glasses lenses to be replaced by a non-professional <ref>Yalkut Yosef (pg 512) </ref> while others forbid. <Ref>Shemirat [[Shabbat]] KeHilchata 15:77 </ref>  
===Hanging up Pictures===
==Pictures==
# Some say that on [[Shabbat]] it’s permitted to hang or remove a picture on a nail already in the wall. <Ref>Yalkut Yosef (pg 527) </ref>
# Some say that on [[Shabbat]] it’s permitted to hang or remove a picture on a nail already in the wall. <Ref>Yalkut Yosef (pg 527) </ref>
==Bottle caps==
===Bottle caps===
# See the [[Opening_bottles_and_containers#Bottle_caps]] page.
# See the [[Opening_bottles_and_containers#Bottle_caps]] page.


==Ice cubes==
===Ice cubes===
# Some are lenient. <Ref>Yalkut Yosef (pg 515) </ref>
# Some are lenient to allow making ice on Shabbat and don't consider it to be constructing ice cubes. <Ref>Yalkut Yosef (pg 515) </ref> In terms of preparing for after Shabbat, see [[Hachana]].
 
===Watches===
# It is forbidden to wind a watch which has stopped working on [[Shabbat]].<ref>Shemirat Shabbat KeHilchata 28:19 </ref> Some say that one may wind it if it is still working.<ref> Yalkut Yosef (pg 512) </ref>
===Shtender===
# Some say that it is permitted to adjust the height of a shtender if (1) the parts aren’t held tightly and (2) the parts are frequently opened and closed (as is common which shtenders in shul). However, if the parts fit tightly or it isn’t opened and closed frequently (as is common which shtenders in a house) it’s forbidden. The pieces are considered held loosely if one isn’t considered if the parts move around where they are joined.<Ref>Or Letzion (vol 2, 27:3). Sh"t Minchat Yitzchak 9:38 prohibits in any event </ref> However, some poskim are lenient in all cases.<ref>Yalkut Yosef (314, pg 504), Shulchan Shlomo 313:7, Sh”t Shevet HaLevi 6:32. Rav Elyashiv (Ashrei Haish 2:20:23) originally was lenient to adjust a shtender with a removable peg, but later in life retracted and was strict. </ref>
 
{{Playpens and Cribs on Shabbat}}
 
===Sukkah Schlock===
# It is permitted to put a rainproof cover (like a plastic tarp) on top of the Sachach of a [[Sukkah]] on [[Yom Tov]] as long as it is clear that one is only doing so to protect the sukkah and also the covering is within 3 tefachim of the sachach. When putting on the cover one should be careful not to move the Sachach because it is [[Muktzeh]]. <Ref>Mishna Brurah 640:25, Shemirat Shabbat KeHilchata 24:12 </ref>
===Mosquito Net===
# Spreading over a mosquito net is different, and would be prohibited according to all Poskim unless it was spread out a the required 3.75 inches prior to [[Shabbos]].<ref>Shemirat Shabbat KeHilchata 24:9, Shevet Halevi 3:54</ref>


==Watches==
===Concrete===
# It is forbidden to wind a watch which has stopped working on [[Shabbat]]. <ref>Shemirat [[Shabbat]] KeHilchata 28:19 </ref> Some say that one may wind it if it is still working. <ref> Yalkut Yosef (pg 512) </ref>
# It is forbidden to pour water on concrete on Shabbat in order to harden it even if one is pouring the water for another purpose like washing one's hands and beneath there is concrete that needs to be hardened. The best option is to use a timer. A worse alternative is to ask a non-Jew to do it using grama, such as pouring the water into a vessel near the concrete which when it overflows spills onto the concrete.<ref>Chazon Ovadia v. 5 p. 277</ref>
==Shtender==
===Hair Gel===
# Some say that it is permitted to adjust the height of a shtender if (1) the parts aren’t held tightly and (2) the parts are frequently opened and closed (as is common which shtenders in shul). However, if the parts fit tightly or it isn’t opened and closed frequently (as is common which shtenders in a house) it’s forbidden. The pieces are considered held loosely if one isn’t considered if the parts move around where they are joined. <Ref>Or Letzion (vol 2, 27:3). Sh"t Minchat Yitzchak 9:38 prohibits in any event </ref> However, some poskim are lenient in all cases. <Ref>Yalkut Yosef (314, pg 504), Shulchan Shlomo 313:7, Sh”t Shevet HaLevi 6:32. </ref>
# It is forbidden to use unscented hair gel on shabbat, however, scented hair gel is permissible. <ref> Ach Tov VaHessed, Year 5783, Page 113 </ref>
==Play pen==
# Some sat that it is permitted to set up a baby’s play pen only if (1) the parts aren’t held tightly and (2) the parts are frequently opened and closed. However, if the parts fit tightly or it isn’t opened and closed frequently it’s forbidden. The pieces are considered held loosely if one isn’t considered if the parts move around where they are joined. <Ref>Or Letzion (vol 2, 27:1) </ref> However, some permit it if it is used frequently. <Ref>Shemirat [[Shabbat]] KeHilchata 24:23 </ref>
# It is forbidden to cover a play pen with a blanket to protect it from the sun or bugs. However if the blanket was spread over the pen from before [[Shabbat]] at least a [[tefach]] in width (not including the part which was rolled up) then one may spread it out fully on [[Shabbat]]. One should make sure not to remove the blanket totally rather leave at least a [[Tefach]] spread out. <ref>Shemirat [[Shabbat]] KeHilchata 24:9 </ref>
==Baby basket==
# It is permitted to adjust the height of a baby’s basket if (1) the parts aren’t held tightly and (2) the parts are frequently opened and closed. However, if the parts fit tightly or it isn’t opened and closed frequently it’s forbidden. The pieces are considered held loosely if one isn’t considered if the parts move around where they are joined. <Ref>Or Letzion (vol 2, 27:1) </ref>
==Sukkah Schlock==
# It is permitted to put a rainproof cover (like a plastic tarp) on top of the Sachach of a [[Sukkah]] on [[Yom Tov]], however, when doing so one should be careful not to move the Sachach because it is [[Muktzeh]]. <Ref>Shemirat [[Shabbat]] KeHilchata 24:10 </ref>
==Folding table==
# It is permitted to open a folding table. <Ref>Shemirat [[Shabbat]] KeHilchata 24:23 </ref>
# It’s permitted to add a table leaf to extend a table on [[Shabbat]] (for temporary use), however, one should take it apart unless one needs the space on that [[Shabbat]]. <ref>Shemirat [[Shabbat]] KeHilchata 24:23, Practical Laws of [[Shabbat]] (Rabbi Rafeal Soae, vol 2, pg 146). Chazon Ovadia (v. 5, p. 315) writes that it is permitted to add a leaf to a table and it doesn’t involve constructing an ohel, since part of the ohel was already in place (and it is temporary). </ref>
# One should not remove a drawer from a table if there’s a depth of a [[Tefach]] in the drawer, however, it is permitted to remove a drawer from a dresser because even after removing the drawer there still remains a roofed structure in the dresser. <Ref>Shemirat [[Shabbat]] KeHilchata 24:24 (and note 85) </ref>
# It is permitted to spread a tablecloth even if it hangs over the side of the table. <Ref>Mishna Brurah 315:31, Shemirat [[Shabbat]] KeHilchata 24:25 </ref>
==Beds==
# It is permitted to spread a bed sheet even if it hangs over the side of the bed. <Ref>Mishna Brurah 315:31, Shemirat [[Shabbat]] KeHilchata 24:25 </ref>
# It is forbidden to put together a crib on [[Shabbat]]. <ref>Shemirat [[Shabbat]] KeHilchata 24:23 </ref>


==Building a wall==
==Building a wall==
# It’s forbidden to build a permanent wall which means that it is meant to last a few days. <Ref>Shemirat [[Shabbat]] KeHilchata 24:26 </ref>
# It’s forbidden to build a permanent wall which means that it is meant to last a few days. <Ref>Shemirat Shabbat KeHilchata 24:26 </ref>
# It is permitted to erect a temporary wall even to protect from the sun or wind; for example it’s permitted to set up temporary walls around a sick person’s bed <Ref>Shemirat [[Shabbat]] KeHilchata 24:27 </ref>
# It is permitted to erect a temporary wall even to protect from the sun or wind; for example it’s permitted to set up temporary walls around a sick person’s bed <Ref>Shemirat Shabbat KeHilchata 24:27 </ref>
# It’s permitted to place a cloth in place of a broken window, but one may not use nails or thumbtacks. <Ref>Shemirat [[Shabbat]] KeHilchata 24:27 </ref>
# It’s permitted to place a cloth in place of a broken window, but one may not use nails or thumbtacks. <Ref>Shemirat Shabbat KeHilchata 24:27 </ref>
# It’s permitted to set up a Parochet (curtain) in front of the Aron in Shul on [[Shabbat]] as long as it doesn’t have a width of a [[Tefach]] as a roof. Some only permit if there are doors besides the curtain while others forbid unless there are doors. <Ref>Rama 315:1, Mishna Brurah 315:7 </ref> If it is a large Parochet it should only be put up by two people so that it doesn’t fold over and form a tent on [[Shabbat]]. <ref>S”A 315:12, Mishna Brurah 315:8 </ref>
# It’s permitted to set up a Parochet (curtain) in front of the Aron in Shul on [[Shabbat]] as long as it doesn’t have a width of a [[Tefach]] as a roof. Some only permit if there are doors besides the curtain while others forbid unless there are doors. <Ref>Rama 315:1, Mishna Brurah 315:7 </ref> If it is a large Parochet it should only be put up by two people so that it doesn’t fold over and form a tent on [[Shabbat]].<ref>S”A 315:12, Mishna Brurah 315:8 </ref>
===Curtains===
===Curtains===
# It’s permitted to set up a curtain in place of a door even if it’s attached at the bottom and top only if it is meant to be set up temporarily (less than a few days). <Ref>Shemirat [[Shabbat]] KeHilchata 24:27 </ref>  
# It is permitted to set up a curtain in place of a door even if it is attached at the bottom and top when one's intention is to hang the curtain temporarily (less than a few days). <Ref>Shemirat Shabbat KeHilchata 24:27 </ref>  
# Some permit setting up a curtain even for many days (permanently) if it is only attached at the top and not the bottom. However, others hold that this is biblically forbidden. Even according to those who permit when put up a large curtain one must make sure to put it up with two people so that it doesn’t fold over while trying to put it up and when it folds over it will form a tent on [[Shabbat]]. <Ref>Shemirat [[Shabbat]] KeHilchata 24:28 quotes the opinion of the Rama 315:1 and Mishna Brurah 315:6 as being lenient against the Chazon Ish 52:13 who is strict, but don’t resolve or take a side in the dispute. The Shemirat [[Shabbat]] KeHilchata insists on putting it up with two people based on the S”A 315:12 </ref>
# Some authorities permit setting up a curtain even for many days (permanently) on the condition that it is only attached at the top of the curtain, but not on the bottom. However, others hold that this is biblically forbidden. One who is relying on those who permit hanging such a curtain, must take care when putting up a large curtain that it does not fold over while trying to put it up, since if it does fold over it will form a tent on [[Shabbat]]. One can put up the curtain with a partner to ensure that the curtain does not fold over while hanging it <Ref>Shemirat Shabbat KeHilchata 24:28 quotes the opinion of the Rama 315:1 and Mishna Brurah 315:6 as being lenient against the Chazon Ish 52:13 who is strict, but don’t resolve or take a side in the dispute. The Shemirat Shabbat KeHilchata insists on putting it up with two people based on the S”A 315:12 </ref>
# Setting up a curtain in place of a window is the same as a door (if it’s temporary it’s permitted, if it’s permanent some permit if one only attaches it at the top while others forbid.) <ref>Shemirat [[Shabbat]] KeHilchata 24:29 </ref>
# Setting up a curtain in place of a window is the same as a door (if it’s temporary it’s permitted, if it’s permanent some permit if one only attaches it at the top while others forbid.) <ref>Shemirat Shabbat KeHilchata 24:29 </ref>


==Links==
==Links==
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[[Category:Orach Chaim]]
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Latest revision as of 14:41, 19 February 2024

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The basic definition of Boneh is creating or assembling any kind of structure. In order to be culpable for Boneh, one need not even build the entire structure; even contributing to the building process can be enough to be culpable. The classic example of the av melacha of Boneh would be the construction of a permanent structure, like a house.[1] The amount of Boneh that one must do to be culpable is any amount.[2]

Two Primary Principles of Boneh

  1. Creating a shelter ("asiat ohel") [3]
  2. Assembling pieces to create a form or structure ("me'dabek chalakim") [4]
  3. Performing either of these actions constitutes a Torah-prohibition, as both of these actions were done in the construction of the Mishkan. An action that involves both of these principles is the av melacha of Boneh.[5] Pitching a tent, even if it does not require assembly, would be asiyas ohel and a toldah of Boneh.[6]

Building shelters and tents

  1. Setting up a functional installation attached to the ground is a violation of Boneh (building). For example, it's forbidden to erect a post in the ground or tomato stake to support a tomato plant.[7]
  2. Laying bricks, setting up rocks as a border to a garden, putting down rocks for landscaping purposes (like chips around a tree or on a road or path), and building a fence are all violations of Boneh (building).[8]
  3. Building a Sukkah is forbidden as Boneh (building).[9]
  4. Building any functional land structure whether it is permanent or temporary is forbidden.[10]
  5. However, using an object as it is normally used such as closing a door is permitted. Similarly one may replace a removable paper towel roll or removable toilet paper holder.[11]

Adding on to a existing structure

  1. Just as it is forbidden to create even a temporary structure on Shabbat, it is forbidden to add onto a permanent structure even if the addition is temporary.[12]
  2. In previous centuries it was common to have dirt floors and it would be forbidden to put down new sand as it is left as a permanent layer of the floor and is a violation of Boneh (building).[13]
  3. Putting down a large area rug which is meant to remain there for more than 7 days is forbidden as it is considered something that can become nullified to the floor.[14]
  4. Tiling a floor, wallpapering a room, installing a doorknob are all forbidden as adding to an existing structure.[15]
  5. According to many poskim it is permitted to rehang a picture that fell on Shabbat as long as the picture isn't expensive and rare.[16]
  6. One should not replace a mezuzah that fell on Shabbat because of issues of adding to an existing structure and muktzeh. However, if it is lying on the floor one pick it up in a abnormal way such as by using the palms of both hands.[17]

Digging and filling a hole

  1. When people used to have dirt floors, if there was a hole in the floor, filling it up would be a violation of Boneh. [18]

Assembling objects

  1. One of the biggest limitations in the melacha of Boneh is its application to keilim, moveable vessels that are not attached to the ground. Ein binyan b’keilim is a concept that appears in several Gemaras[19] and is the subject of an enormous machlokes[20] among the rishonim, achronim, and poskim. Despite the all-encompassing implication of “ein binyan b’keilim,” most rishonim and poskim say that there are situations when one can make a kli and be chayav on a biblical level for Boneh. The general consensus among most rishonim is that Boneh does apply to keilim when one makes a kli in its entirety[21] or if one uses strength and craft (chizuk v’umanus) in the process of making it.[22]
  2. Making a utensil loosely is permitted if it usually is made loosely, but it is forbidden to fit it together tightly or even loosely if it usually fits together tightly.[23] For example, constructing an army cot from pieces that come apart on Shabbat or Yom Tov is forbidden since the legs fight in tightly.
    1. If a shtender is made of multiple pieces it is forbidden to construct or reassemble if it is apart unless it is so loose that the pieces would wobble in their sockets.[24]
  3. Covering a pot with a cover tightly is permitted since it is meant to be opened and closed all the time.[25]
  4. A shtender which can have its height adjusted with a knob but isn't frequently adjusted, according to many poskim it is permitted to adjust the height on Shabbat, and according to others it is forbidden.[26]
  5. Making an earth vessel such as an oven or barrel before it is hardened in the kiln is a violation of Boneh.[27]
  6. One shouldn't untangle Tzitzit strings on Shabbat because this involves Tikkun Kli (fixing of a vessel).[28]
  7. One shouldn't make a paper boat or paper hat by folding the paper since this involves creating a vessel.[29]
  8. One may fold a napkin regularly, but one shouldn't fold it in a special shape, such as is normally done in honor of guests.[30] Some are lenient.[31]

In the Mishkan

  1. The melacha of Boneh was done in the Mishkan when they placed the kerashim, the planks that made up the walls, into their sockets.[32]

Building a Tent

  1. It is forbidden to set up the roof of a tent, permanent or temporary, on Shabbat, even if one there are no walls. Additionally, it’s forbidden to add onto a tent structure, however, a temporary addition to an existing structure is permitted.[33]
  2. It is forbidden to set up a tent out of blankets even if it is meant to be temporary.[34]

Adding an existing structure

  1. It’s permitted to make a temporary addition to an existing tent. Therefore, if there is a Tefach of roof already opened before Shabbat one may continue to add a temporary addition to that roof, but one should only add to the existing roof starting from the side which is already roofed. [35]
  2. One may not put a mat on top of polls or walls even if the mat is rolled up if there is a Tefach of width to the roll of the mat. Even if the rolled mat was put there before Shabbat one may not unroll it on Shabbat, however, if a Tefach of the mat was already unrolled then it is permitted to continue to unroll it on Shabbat.[36]

Roof Which is Attached

  1. If a roof was attached before Shabbat with hinges or another permanent connection it is permitted to spread out that roof (which was attached) on Shabbat.[37]
  2. Some poskim, including Rav Moshe Feinstein,[38] hold that the hood needs to be opened one Tefach (approx. 3.75 inches) prior to Shabbos. However, other Poskim, including Chazon Ish,[39] permitted it no matter what, claiming that there is no issue of Assiyas Ohel (making a covering) since it is all attached from before Shabbos.
    1. A normal umbrella that is attached to a stroller may not be opened on Shabbat. This is true even for the lenient opinion who permits opening a stroller hood.[40]
  3. Once the hood is open it is permitted to add a temporary additional roof, such as a rain cover or a blanket. One should start to add to that roof from the side which is already covered (by the hood).[41] There is a question whether it is permitted to add the raincover or blanket if they're not at the same height as the hood. When they're at the same height they are permitted since they extend the original ohel. If it is more than 3 tefachim away, either vertically or laterally, it is certainly forbidden to add the rain cover or blanket.[42]
    1. It is permitted to add a rain cover on Shabbat even if the hood was opened on Shabbat.[43]
  4. If there is a stroller hood which was open a tefach, it is permitted to open it further on Shabbat.[44]

Practical Examples of Building

Folding table

  1. It is permitted to open a folding table.[45]
  2. It’s permitted to add a table leaf to extend a table on Shabbat for temporary use,[46] however, one should not take it apart on Shabbat unless one needs the space on that Shabbat.
  3. One should not remove a drawer from a table if there’s a depth of a Tefach in the drawer, however, it is permitted to remove a drawer from a dresser because even after removing the drawer there still remains a roofed structure in the dresser.[47]
  4. It is permitted to spread a tablecloth even if it hangs over the side of the table. [48]

Umbrella

  1. The Rabbis forbade opening and closing an umbrella on Shabbat. Furthermore, they forbade using an umbrella that’s already opened from before Shabbat. [49]
  2. An umbrella is muktzeh since it cannot be used [50]

Binoculars

See Binoculars and Telescopes on the Games on Shabbat page

Setting up a Mechitza

  1. It’s permissible to set up a partition as a mechitzah in shul between men and women on Shabbat.[51]

Saltshakers

  1. It is permitted to open and close a saltshaker on Shabbat.[52]

Pot covers

  1. It is permitted to cover or remove the cover on a pot on Shabbat.[53] Some say that one may not cover a pot which is larger than 40 seah.[54]

Glasses

  1. Some poskim permit a glasses lenses to be replaced by a non-professional [55] while others forbid. [56]

Hanging up Pictures

  1. Some say that on Shabbat it’s permitted to hang or remove a picture on a nail already in the wall. [57]

Bottle caps

  1. See the Opening_bottles_and_containers#Bottle_caps page.

Ice cubes

  1. Some are lenient to allow making ice on Shabbat and don't consider it to be constructing ice cubes. [58] In terms of preparing for after Shabbat, see Hachana.

Watches

  1. It is forbidden to wind a watch which has stopped working on Shabbat.[59] Some say that one may wind it if it is still working.[60]

Shtender

  1. Some say that it is permitted to adjust the height of a shtender if (1) the parts aren’t held tightly and (2) the parts are frequently opened and closed (as is common which shtenders in shul). However, if the parts fit tightly or it isn’t opened and closed frequently (as is common which shtenders in a house) it’s forbidden. The pieces are considered held loosely if one isn’t considered if the parts move around where they are joined.[61] However, some poskim are lenient in all cases.[62]

Playpen

  1. Some sat that it is permitted to set up a baby’s play pen only if (1) the parts aren’t held tightly and (2) the parts are frequently opened and closed. However, if the parts fit tightly or it isn’t opened and closed frequently it’s forbidden. The pieces are considered held loosely if one isn’t considered if the parts move around where they are joined. [63] However, some permit it if it is used frequently. [64]
  2. It is forbidden to cover a play pen with a blanket to protect it from the sun or bugs. However if the blanket was spread over the pen from before Shabbat at least a tefach in width (not including the part which was rolled up) then one may spread it out fully on Shabbat. One should make sure not to remove the blanket totally rather leave at least a Tefach spread out. [65]
  3. As long as there are no screws, bolts (etc.) one may set up and dismantle a playpen, pac-n-play or carriage[66]. For carriages that come with a separate bassinet (i.e. BabyJogger, Bugaboo, Rock Star etc.), one may switch them back and forth without any Halachic concerns as long as no screws are being used. One would also be allowed to add another seat to a carriage (i.e. Phil & Ted), providing that this is done on an "everyday basis", as it would then be considered the "usual mode of use"[67].

Baby Basket

  1. It is permitted to adjust the height of a baby’s basket if (1) the parts aren’t held tightly and (2) the parts are frequently opened and closed. However, if the parts fit tightly or it isn’t opened and closed frequently it’s forbidden. The pieces are considered held loosely if one isn’t considered if the parts move around where they are joined. [68]

Beds

  1. It is permitted to spread a bed sheet even if it hangs over the side of the bed.[69]
  2. It is forbidden to put together a crib on Shabbat.[70]

Sukkah Schlock

  1. It is permitted to put a rainproof cover (like a plastic tarp) on top of the Sachach of a Sukkah on Yom Tov as long as it is clear that one is only doing so to protect the sukkah and also the covering is within 3 tefachim of the sachach. When putting on the cover one should be careful not to move the Sachach because it is Muktzeh. [71]

Mosquito Net

  1. Spreading over a mosquito net is different, and would be prohibited according to all Poskim unless it was spread out a the required 3.75 inches prior to Shabbos.[72]

Concrete

  1. It is forbidden to pour water on concrete on Shabbat in order to harden it even if one is pouring the water for another purpose like washing one's hands and beneath there is concrete that needs to be hardened. The best option is to use a timer. A worse alternative is to ask a non-Jew to do it using grama, such as pouring the water into a vessel near the concrete which when it overflows spills onto the concrete.[73]

Hair Gel

  1. It is forbidden to use unscented hair gel on shabbat, however, scented hair gel is permissible. [74]

Building a wall

  1. It’s forbidden to build a permanent wall which means that it is meant to last a few days. [75]
  2. It is permitted to erect a temporary wall even to protect from the sun or wind; for example it’s permitted to set up temporary walls around a sick person’s bed [76]
  3. It’s permitted to place a cloth in place of a broken window, but one may not use nails or thumbtacks. [77]
  4. It’s permitted to set up a Parochet (curtain) in front of the Aron in Shul on Shabbat as long as it doesn’t have a width of a Tefach as a roof. Some only permit if there are doors besides the curtain while others forbid unless there are doors. [78] If it is a large Parochet it should only be put up by two people so that it doesn’t fold over and form a tent on Shabbat.[79]

Curtains

  1. It is permitted to set up a curtain in place of a door even if it is attached at the bottom and top when one's intention is to hang the curtain temporarily (less than a few days). [80]
  2. Some authorities permit setting up a curtain even for many days (permanently) on the condition that it is only attached at the top of the curtain, but not on the bottom. However, others hold that this is biblically forbidden. One who is relying on those who permit hanging such a curtain, must take care when putting up a large curtain that it does not fold over while trying to put it up, since if it does fold over it will form a tent on Shabbat. One can put up the curtain with a partner to ensure that the curtain does not fold over while hanging it [81]
  3. Setting up a curtain in place of a window is the same as a door (if it’s temporary it’s permitted, if it’s permanent some permit if one only attaches it at the top while others forbid.) [82]

Links

Sources

  1. ↑ Rav Eli Baruch Shulman highlighted a Rashi in Beitzah, 11b (s.v. d’ein binyan b’keilim) that says the reason that there is no binyan by keilim (according to Beis Hillel) is because Boneh applies only to binyan batim.
  2. ↑ Mishnah, Shabbos 102b. The Gemara says this is learned from the Mishkan where they would fill up wormholes in the kerashim with melted lead.
  3. ↑ Rambam 7,6 This was done in the Mishkan when the walls and rooftops were assembled.
  4. ↑ Rambam 11,13 and 22,27 This was done in the Mishkan when the planks were assembled.
  5. ↑ Rambam as explained by the Even Ha'ezel 10,17. For instance, Rambam Hilchos Shabbos 7:6 writes that making cheese on Shabbos is a violation of Boneh, as it involves combining pieces together to create a new object.
  6. ↑ Rambam, Hilchos Shabbos, 10:13
  7. ↑ 39 Melachos (Rabbi Ribiat, vol 4, pg 1005)
  8. ↑ 39 Melachos (Rabbi Ribiat, vol 4, pg 1006)
  9. ↑ 39 Melachos (Rabbi Ribiat, vol 4, pg 1010)
  10. ↑ 39 Melachos (Rabbi Ribiat, vol 4, pg 1012) explains that if it is a construction that can't be taken apart and only can be broken then it's forbidden biblically whether it is permanent or temporary and if it is a assembly that can be dismantled then building it for temporary purposes (less than 7 days) is a rabbinic violation and building it for permanent purposes is biblical violations.
  11. ↑ 39 Melachos (Rabbi Ribiat, vol 4, pg 1014-5)
  12. ↑ Kitzur Shulchan Aruch 80:67
  13. ↑ 39 Melachos (Rabbi Ribiat, vol 4, pg 1015)
  14. ↑ 39 Melachos (Rabbi Ribiat, vol 4, pg 1017 and 1019) explains that since it is only a loose addition it doesn't become nullified to the floor unless it is put there for 7 days. See Dor Hamelaktim v. 4 p. 2040 who quotes Shabbos Home (Artscroll, p. 423) as being lenient unless the carpet is from wall to wall.
  15. ↑ 39 Melachos (Rabbi Ribiat, vol 4, pg 1016-7)
  16. ↑ 39 Melachos (Rabbi Ribiat, vol 4, pg 1019) explains that that according to many opinions hanging a picture isn't a violation of adding to a existing structure because it retains it's own function similar to putting a potted plant on the floor or a vessel in the breakfront even though it will remain for a long time. On pg 1038 he writes that it's permissible to rehang it unless it is a expensive and rare painting because it would be muktzah and according to some poskim it's muktzeh once it was attached during the onset of Shabbat.
  17. ↑ 39 Melachos (Rabbi Ribiat, vol 4, pg 1038)
  18. ↑ In Gemara (Shabbat 73b) Rava says that if one fills in a hole with dirt inside the house, one has violated Boneh. Rambam (Shabbat 10:12) rules that flattening the ground indoors, by flattening a mound or filling in a hole is a violation of Boneh. Mishna Brurah 337:6 writes that if one intentionally fills the holes when sweeping one would violate Boneh.
  19. ↑ Shabbos 102b, 122b and Beitzah 11b are some examples
  20. ↑ According to Rashi Shabbat 74b s.v. ve’iy there is no issue of boneh when constructing a utensil and only if it is attached to the ground is it boneh, altogether either way it’ll be macah b’patish. However, Tosfot s.v. chavita argues that creating a kli is also boneh as the gemara Shabbat 102b cites the opinion of Rav who holds that assembling a shovel is boneh. Maginei Shlomo Shabbat 102b answers Tosfot’s question based on the Ramban (Milchamot Shabbat 37a) who explains that many other amoraim disagree with Rav and hold that there's no boneh in constructing utensils. See Peni Yehoshua Shabbat 74b for another answer. Nonetheless, the conclusion of most rishonim is that it is boneh to create a utensil from scratch like Tosfot. This is the opinion of Baal Hameor (on Rif Shabbat 37a s.v. ayil), Ran (37a s.v. makshu), Ramban (102b s.v. rav), and Rashba (102b s.v. hay). For further reading, the sefer Binyan Shabbos (Part 1) dedicates several chapters to this topic.
  21. ↑ Chiddushei HaRamban, Shabbos 102b, s.v. Rav Amar. Also see Tosfos, Shabbos 74b, s.v. Chavisa
  22. ↑ Tosfos, Shabbos 102b, s.v. Hai. It should be noted that Rashi (Shabbos 47a, s.v. Chayav Chatas; Beitza 11b, s.v. d’ein) seems to be of the opinion that there is no concept of binyan b’keilim at all. However, Rashi says (Shabbos 47a) that there are cases, like making a kli in its entirety, when one would be chayav for makeh b’patish.
  23. ↑ The Gemara Shabbat 47a cites a dispute whether constructing a bed in a loose fashion is permitted but everyone agrees if it is tight it is forbidden. The Shulchan Aruch 313:6 rules that if it is loose it is permitted. Rama 313:6 writes that it is only permitted to assemble a utensil in a loose fashion if it is normally loose, however, if it is usually tight and you just made it loose once there is a concern you'll make it tight this time. The Bet Yosef cites this concept from the Hagahot Ashuri Shabbat 3:23 and infers it from the Rambam 22:26.
  24. ↑ Shulchan Aruch 313:6 cites a dispute whether constructing a cup is similar to constructing a bed. Mishna Brurah 313:45 explains the dispute is whether a cup which is which put together tightly but not hammered together is judged like a bed or not. Mishna Brurah 313:46 writes that initially we are strict to assume that it is the same halacha as a bed but if there's a need of Shabbat we are lenient. Lastly, Mishna Brurah 313:47 equates a shtender made of pieces to a cup. Shulchan Aruch 313:6 only permits constructing a bed if it is loose. Biur Halacha 313:6 s.v. darka cites the Raavad who explains that loose means that it is so loose that it would wobble in its socket.
  25. ↑ Mishna Brurah 313:45
  26. ↑ Rav Shlomo Zalman Auerbach in Meor HaShabbat (v. 2 Letter 32:3) holds that it is permitted to adjust the height of a shtender with a knob which tightens and loosens, even if it is only infrequently adjusted, since the shtender is like covering and uncovering a pot, which was a utensil before and after the use. However, Minchat Yitzchak 9:38 disagrees since the shtender is only infrequently adjusted unlike a pot cover. See Dirshu (Mishna Brurah 313:45) and Peninei Halacha Shabbat 15:6.
  27. ↑ Rambam (Shabbat 10:13)
  28. ↑ Shemirat Shabbat Kehilchata 15:94
  29. ↑ Shemirat Shabbat Kehilchata 16:21
  30. ↑ Shemirat Shabbat Kehilchata 28:17
  31. ↑ Rivevot Efraim 1:223:8 quoting Rav Moshe Feinstein. See also Dor Hamelaktim v. 2 p. 1214 for more opinions.
  32. ↑ Yerushalmi Shabbos, 7th and 12th Perek
  33. ↑ Shemirat Shabbat KeHilchata 24:1-2
  34. ↑ Menuchat Ahava (vol 3, 23:8), Shemirat Shabbat KeHilchata 24:1-2
  35. ↑ Shemirat Shabbat KeHilchata 24:6
  36. ↑ Shemirat Shabbat KeHilchata 24:5, 7
  37. ↑ Shemirat Shabbat KeHilchata 24:13
  38. ↑ Igros Moshe O.C. 4:105:3, Or Letzion 2:28:1
  39. ↑ Chazon Ish O.C. 52:6, Rav Elyashiv (Ashrei Haish 2:20:5), Shemirat Shabbat Kehilchata 24:13, Orchot Shabbat 9:28, Be'er Moshe 6:87, Rav Mordechai Willig (Chol Hamoed Shiur 19 min 1). Rav Schachter (Highlights of Melachos Shabbat Part 2, min 61) noted this dispute between the Chazon Ish and Rav Moshe and seemed to prefer the Chazon Ish. Chazon Ish OC 52:6 holds that it is permitted to open and close the roof of a baby carriage and it isn't considered like creating an ohel to protect from the sun. His reasoning is that it since it is attached to the carriage opening it is like extending a preexisting ohel. Also, it is like opening and closing a door which is built to do that. See Rama 626:3 regarding opening and closing a shlock for the sukkah and Mishna Brurah 315:27 regarding shtenders. In that piece Chazon Ish is disagreeing with the Nodeh Beyehuda OC 2:30 regarding umbrellas. Shemirat Shabbat KeHilchata 24:13 agrees and is lenient. Rav Ovadia Yosef in Chazon Ovadia (Shabbat v. 5 p. 302) writes that one should be strict for the Nodeh Beyehuda unlike Chazon Ish. Yalkut Yosef 315:12 quotes those who are strict and concludes that it is proper to leave it a tefach (excluding the folded part) open before Shabbat and extend it or fold it up on Shabbat.
  40. ↑ Rav Elyashiv (Ashrei Haish 2:20:5)
  41. ↑ Shemirat Shabbat Kehilchata 24:13, Orchot Shabbat 9:28
  42. ↑ Orchot Shabbat 9:29
  43. ↑ Rav Mordechai Willig (Chol Hamoed Shiur 19 min 1). Rav Eliyahu Pesach Polek in Piyha Pitcha Bchochma v. 2 p. 85 writes that it is permitted to add a rain cover to a covering that is open 1 tefach even if that opening was opened on Shabbat. He says that in fact that it seems that it should be permitted to add the rain cover even if the hood was forbidden to open since it isn't considered a direct benefit from a transgression of Shabbat to extend that covering.
  44. ↑ Shulchan Aruch O.C. 315:2. Or Letzion 2:28:1 applies Shulchan Aruch to a stroller hood.
  45. ↑ Shemirat Shabbat KeHilchata 24:23
  46. ↑ Shemirat Shabbat KeHilchata 24:23, Rivivot Ephraim 1:222:3, Practical Laws of Shabbat (Rabbi Rafeal Soae, vol 2, pg 146). Rav Elyashiv (Ashrei Haish 2:18:17) writes that it is permitted in a case of great need, otherwise it should be extended before Shabbat. Chazon Ovadia (v. 5, p. 315) writes that it is permitted to add a leaf to a table and it doesn’t involve constructing an ohel, since part of the ohel was already in place (and it is temporary).
  47. ↑ Shemirat Shabbat KeHilchata 24:24 (and note 85)
  48. ↑ Mishna Brurah 315:31, Shemirat Shabbat KeHilchata 24:25
  49. ↑ Shemirat Shabbat KeHilchata 24:15, Biur Halacha 315:7, Ben Ish Chai (second year Shemot #8), Noda Biyehuda 1:30, Rabbi Eli Mansour, Rivevot Ephraim 7:105 and 2:115:61. see however Chatam Sofer OC 72 who is lenient
  50. ↑ Shemirat Shabbat KeHilchata 24:15
  51. ↑ Yalkut Yosef (vol 2, 315, pg 531), Rav Soloveitchik (cited in Nefesh Harav pg. 170), Rav Schachter (Highlights of Melachos Shabbat Part 2, min 62)
  52. ↑ Minchat Shlomo 1:11:4 says that this isn't an issue of boneh since it isn't typically screwed on tightly.
  53. ↑ Yalkut Yosef (pg 506)
  54. ↑ Or Letzion (vol 2, chap 28:5)
  55. ↑ Yalkut Yosef (pg 512)
  56. ↑ Shemirat Shabbat KeHilchata 15:77
  57. ↑ Yalkut Yosef (pg 527)
  58. ↑ Yalkut Yosef (pg 515)
  59. ↑ Shemirat Shabbat KeHilchata 28:19
  60. ↑ Yalkut Yosef (pg 512)
  61. ↑ Or Letzion (vol 2, 27:3). Sh"t Minchat Yitzchak 9:38 prohibits in any event
  62. ↑ Yalkut Yosef (314, pg 504), Shulchan Shlomo 313:7, Sh”t Shevet HaLevi 6:32. Rav Elyashiv (Ashrei Haish 2:20:23) originally was lenient to adjust a shtender with a removable peg, but later in life retracted and was strict.
  63. ↑ Or Letzion (vol 2, 27:1)
  64. ↑ Shemirat Shabbat KeHilchata 24:23
  65. ↑ Shemirat Shabbat KeHilchata 24:9
  66. ↑ Be'er Moshe 3:85
  67. ↑ Rabbi Heshy Kahn (What's Doing, Greater Connecticut, 3/3/11) heard from R' Plutchok Shlita
  68. ↑ Or Letzion (vol 2, 27:1)
  69. ↑ Mishna Brurah 315:31, Shemirat Shabbat KeHilchata 24:25
  70. ↑ Shemirat Shabbat KeHilchata 24:23
  71. ↑ Mishna Brurah 640:25, Shemirat Shabbat KeHilchata 24:12
  72. ↑ Shemirat Shabbat KeHilchata 24:9, Shevet Halevi 3:54
  73. ↑ Chazon Ovadia v. 5 p. 277
  74. ↑ Ach Tov VaHessed, Year 5783, Page 113
  75. ↑ Shemirat Shabbat KeHilchata 24:26
  76. ↑ Shemirat Shabbat KeHilchata 24:27
  77. ↑ Shemirat Shabbat KeHilchata 24:27
  78. ↑ Rama 315:1, Mishna Brurah 315:7
  79. ↑ S”A 315:12, Mishna Brurah 315:8
  80. ↑ Shemirat Shabbat KeHilchata 24:27
  81. ↑ Shemirat Shabbat KeHilchata 24:28 quotes the opinion of the Rama 315:1 and Mishna Brurah 315:6 as being lenient against the Chazon Ish 52:13 who is strict, but don’t resolve or take a side in the dispute. The Shemirat Shabbat KeHilchata insists on putting it up with two people based on the S”A 315:12
  82. ↑ Shemirat Shabbat KeHilchata 24:29
Category Topic
Mitzvot of Shabbat
Kiddush Levana - Enjoying Shabbat - Fourth meal of Shabbat - Havdalah - Having a meal on Friday - In the Spirit of Shabbat - Kiddush - Lighting Shabbat Candles - Making Early Shabbat - Making one hundred Brachot on Shabbat - Preparing foods on Shabbat - Preparing for Shabbat - Shenayim Mikrah - Kavod Shabbat - Shabbos Davening - Seudat Shabbat - Seudat Shelishit - Lechem Mishneh - Motzei Shabbat - When Does Shabbat Start?
Restrictions of Shabbat
Allowing Carrying Using an Eruv Chatzerot - Animals on Shabbat - Asking a Jew to work on Shabbat - Asking a non-Jew to work on Shabbat (Amirah LeNochri) - Benefiting from a Violation of Shabbat (Maaseh Shabbat) - Books, notebooks, and papers - Brushing Teeth on Shabbat - Building a structure on Shabbat (Boneh) - Carrying on Shabbat - Cleaning the dishes - Cleaning and Folding Garments on Shabbat - Clearing the table - Cooking (Ofeh and Bishul) - Cosmetics on Shabbat - Dancing and clapping on Shabbat - Electricity on Shabbat - Eruv Chatzerot - Eruvin - Games on Shabbat - Getting dressed on Shabbat - Giving birth on Shabbat - Grinding (Tochen) - Handling objects on Shabbat (Muktzeh) - Infants on Shabbat - Introduction to the Modern Eruv - Kneading (Lash) - Mail on Shabbat - Medicine on Shabbat (Refuah on Shabbat) - Melacha That Begins Before Shabbat - Opening bottles and containers (Boneh) - Plants on Shabbat (Zoreah) - Preparing for after Shabbat (Hachana) - Reading on Shabbat (Daber Davar) - Recreation on Shabbat - Sechirut Reshut - Separating mixtures (Borer) - Squeezing fruits (Sechita) - Speaking on Shabbat (Daber Davar) - Taking a cruise over Shabbat - Taking measurements on Shabbat - Techum - Transactions on Shabbat - Transportation on Shabbat - Going to and Staying in the Hospital on Shabbat - Wages on Shabbat (Sachar Shabbat) - Washing one’s body on Shabbat
Melachos
Introduction to Melechet Machshevet - Marbeh Bshiurim - Plowing - Planting - Harvesting - Gathering - Threshing - Winnowing - Separating - Grinding - Sifting - Kneading - Baking and Cooking - Shearing - Laundering - Combing - Dyeing - Spinning - Mounting warp threads - Making two loops - Weaving - Unraveling fabric - Tying - Untying - Gluing, taping, or stapling - Ripping - Trapping - Slaughtering - Skinning - Tanning - Smoothing - Scoring - Cutting precisely - Writing - Erasing - Building - Demolishing - Completing a vessel - Extinguishing a flame - Kindling a fire - Carrying
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