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Not a letter from the Gaon, exactly, but a personal instruction to that effect. The story is that one day, in the Yeshiva in Baghdad, they were debating the meaning of the phrase שמן ראש אל יני ראשי (Tehillim 141:5). Rav Hai Gaon instructed R' Matzliach ibn al-Bazak, later a dayan in Sicily and one of the teachers of R' Nassan Baal HaAruch, to ask the local (...


2

Halachic decisors prohibit ordering something which is guaranteed to be delivered on Shabbat in normal circumstances (see the last paragraph for exceptions). R Doniel Neustadt explains the general principle (here) Amirah l’akum, giving instructions to a non-Jew to do an action which would be forbidden for a Jew to do on Shabbos, is prohibited. It makes no ...


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