May a knot that is time-limited (not permanent) and strong (amitz) be tied or untied through a non-Jew on Shabbat?
Synopsis
The Mishnah Berurah citing the acharonim permits asking a non-Jew to tie or untie a strong but time-limited knot when there is significant need, as it constitutes a shvut d'shvut (double rabbinic prohibition — the knot itself is only rabbinic and asking a non-Jew is rabbinic).
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Discussion
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