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5. Making a knot for the sake of a Mitzvah:[1]
A knot which is not Biblically considered a permanent knot but rather only Rabbinically is allowed to be tied for the sake of a Mitzvah, such as to make a knot in order to measure one of the Torah required measurements.[2] Even to tie a professional knot is allowed if it is impossible to measure it otherwise.[3]
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[1] Admur 317:4; Michaber 317:1; Mishneh Shabbos 157a as rules the Rambam and Tur; M”B 317:13; Shaar Hatziyon 317:6
Other opinions: Some Poskim rule that according to Rashi [on Mishneh ibid] and Tosafus it is forbidden to tie a Rabbinical knot even for the sake of a Mitzvah. [Beis Meir, brought in M”B 317:13]
[2] Back then measuring was done through a rope have knots made on the various parts of the rope which represent different measurements.
The reason: The reason specifically by the laws of Kosher the Sages were lenient to permit tying for the sake of a Miztvah is because the Rabbinical prohibition is not due to a decree that one may come to do an Issur, but rather being it is similar to the Biblical Melacha, and for this reason we are stringent. [See Likkutei Sichos 14 p. 15]
[3] Admur ibid; M”A 317:3; M”B 317:12
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