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* The Bet Yosef 317:1 explains based on the Tur that a knot that lasts for less than a week is considered to be untied every day. Yalkut Yosef (vol 2 p. 555) agrees. Rama 317:1, however, quotes the Maharam MiRotenburg’s who says that a knot that lasts for more than a day is forbidden. Pri Megadim (E”A 317:2) and Mishna Brurah 317:6 clarify that one day means 24 hours. Sh”t Yabea Omer 8:39:8 agrees that one day means 24 hours for this halacha, unlike the Tal Orot who says that it goes by the halachic day. Taz 317:1, Eliyah Rabba 317:2 Aruch HaShulchan 317:8, and Kaf HaChaim 317:14 rule like the Maharam. </ref> | * The Bet Yosef 317:1 explains based on the Tur that a knot that lasts for less than a week is considered to be untied every day. Yalkut Yosef (vol 2 p. 555) agrees. Rama 317:1, however, quotes the Maharam MiRotenburg’s who says that a knot that lasts for more than a day is forbidden. Pri Megadim (E”A 317:2) and Mishna Brurah 317:6 clarify that one day means 24 hours. Sh”t Yabea Omer 8:39:8 agrees that one day means 24 hours for this halacha, unlike the Tal Orot who says that it goes by the halachic day. Taz 317:1, Eliyah Rabba 317:2 Aruch HaShulchan 317:8, and Kaf HaChaim 317:14 rule like the Maharam. </ref> | ||
===Permissible knots=== | ===Permissible knots=== | ||
# A knot which is both non-professional and meant to be undone within 24 hours may be tied. <Ref> The Rama 317:1 quoting Tur and Mordechai; Mishna Brurah (317:6) explains it as anything less than 24 hours. </ref> Some Sephardic authorities permit a non-professional knot which is meant to last less than 7 days. <Ref> Rama also quotes Kol Bo and | # A knot which is both non-professional and meant to be undone within 24 hours may be tied. <Ref> The Rama 317:1 quoting Tur and Mordechai; Mishna Brurah (317:6) explains it as anything less than 24 hours. </ref> Some Sephardic authorities permit a non-professional knot which is meant to last less than 7 days. <Ref> Rama also quotes Kol Bo and Hagahot Maymoniyot. Chazon Ovadia Shabbat Part 5 page 47 and Yalkut Yosef (317:6) writes that Sephardim hold like this opinion. </ref> | ||
# Even if you personally intend to leave it less than 24 hours, if it’s a knot sometimes left permanently by people it’s forbidden Rabbinically to prevent confusion between temporary and permanent knots. <Ref> Magan Avraham (317:20), Kol Sinai (Koshair #3) </ref> | # Even if you personally intend to leave it less than 24 hours, if it’s a knot sometimes left permanently by people it’s forbidden Rabbinically to prevent confusion between temporary and permanent knots. <Ref> Magan Avraham (317:20), Kol Sinai (Koshair #3) </ref> | ||
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* See Torat HaMelachot (p. 79-80) quotes Rav Nissim Karelitz as permitting a “full-Windsor” knot but forbidding a “four in hand”. See Chut Shani (vol 2, p. 227).</ref> | * See Torat HaMelachot (p. 79-80) quotes Rav Nissim Karelitz as permitting a “full-Windsor” knot but forbidding a “four in hand”. See Chut Shani (vol 2, p. 227).</ref> | ||
==Single knot== | ==Single knot== | ||
# It is forbidden to tie a single knot with one string onto itself. <Ref> Rama (317:1) quoting the | # It is forbidden to tie a single knot with one string onto itself. <Ref> Rama (317:1) quoting the Hagahot Alfasi, Kitzur S"A 80:45, Shemirat Shabbat KeHilchata (in the new edition 15:52) </ref> | ||
## In situations where it's common to tie a double knot such as the last knot of a tzitzit fringe one may tie a single knot. <ref>Shemirat Shabbat KeHilchata (in the new edition 15:53) </ref> | ## In situations where it's common to tie a double knot such as the last knot of a tzitzit fringe one may tie a single knot. <ref>Shemirat Shabbat KeHilchata (in the new edition 15:53) </ref> | ||
# It is permitted to tie a single knot in two strands of string even if it is tight and meant never to be undone. <Ref>S”A HaRav 317:1, Yalkut Yosef (317:11, [[Shabbat]], vol 2, pg 562), The Shabbos Home (Rabbi Simcha Cohen, vol 1, chap 13, pg 207) </ref> | # It is permitted to tie a single knot in two strands of string even if it is tight and meant never to be undone. <Ref>S”A HaRav 317:1, Yalkut Yosef (317:11, [[Shabbat]], vol 2, pg 562), The Shabbos Home (Rabbi Simcha Cohen, vol 1, chap 13, pg 207) </ref> |