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Koshair: Difference between revisions

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On [[Shabbat]], there are certain types of knots that one may tie or untie and some that one may not tie or untie. See below for details and practical applications.
On [[Shabbat]], there are certain types of knots that one may tie or untie and some that one may not tie or untie. See below for details and practical applications.
== The Basics of Koshair ==
== The Basics of Koshair ==
= Melechos Koshair and Matir (Jonathan Tavin) =
'''Where was it in the Mishkan?''' The gemara<ref>Shabbat 74b</ref> explains that Koshair was performed in the construction of the Mishkan by the trappers of ''chilazon'' who would tie knots in their nets in order to adjust their nets.
'''Where was it in the Mishkan?''' The gemara<ref>Shabbat 74b</ref> explains that Koshair was performed in the construction of the Mishkan by the trappers of ''chilazon'' who would tie knots in their nets in order to adjust their nets.
'''Definition''': There is an important machlokes Rishonim as to the definition of a knot that would warrant a chiyuv min hatorah. According to Rashi<ref> Shabbos 112a s.v. b’dirabanan</ref> and Rosh<ref> Shabbos 15:1</ref>, as long as the knot is intended to stay tied forever or for a long time, one is chayav min hatorah for tying it. According to Rambam<ref name="ftn151"> Shabbos 10:1</ref> and Rif<ref name="ftn152"> Shabbos 41b</ref>, not only must one intend to keep it tied for a long time to be chayav min hatorah, it must also be defined as a ''kesher uman''—professional knot, such as a sailor’s or camel-driver’s knot.
 
'''Definition''': There is an important machlokes Rishonim as to the definition of a knot that would warrant a chiyuv min hatorah. According to Rashi<ref> Shabbos 112a s.v. b’dirabanan</ref> and Rosh<ref> Shabbos 15:1</ref>, as long as the knot is intended to stay tied forever or for a long time, one is chayav min hatorah for tying it. According to Rambam<ref> Shabbos 10:1</ref> and Rif<ref name="ftn152"> Shabbos 41b</ref>, not only must one intend to keep it tied for a long time to be chayav min hatorah, it must also be defined as a ''kesher uman'' - professional knot, such as a sailor’s or camel-driver’s knot.
 
'''Permanence''':There are different opinions as to what constitutes a ‘long time.’ The Kol Bo<ref> Cited in Rama 317:1</ref> says that a knot that is tied for more than one day is called somewhat permanent, and it is rabbinically forbidden to tie. The Tur and Mordechai<ref> As cited in Rema 317:1. Tur in 317 says that a knot is only permanent enough to be chayav chatas if it is able to be kept forever, but a knot meant to last seven days is patur aval assur.</ref> say that a knot that is tied for more than seven days is permanent. Rabbeinu Yerucham<ref> Cited in Beit Yosef 317:1</ref> says that only a knot that is tied for half a year or a year is considered permanent.
'''Permanence''':There are different opinions as to what constitutes a ‘long time.’ The Kol Bo<ref> Cited in Rama 317:1</ref> says that a knot that is tied for more than one day is called somewhat permanent, and it is rabbinically forbidden to tie. The Tur and Mordechai<ref> As cited in Rema 317:1. Tur in 317 says that a knot is only permanent enough to be chayav chatas if it is able to be kept forever, but a knot meant to last seven days is patur aval assur.</ref> say that a knot that is tied for more than seven days is permanent. Rabbeinu Yerucham<ref> Cited in Beit Yosef 317:1</ref> says that only a knot that is tied for half a year or a year is considered permanent.