Is trimming nails and cutting hair prohibited on Rosh Chodesh even if it falls on Erev Shabbat?
Synopsis
A custom (cited by Magen Avraham and Aruch HaShulchan) prohibits cutting hair or nails on Rosh Chodesh based on the will of R' Yehudah HaChasid, even when Rosh Chodesh falls on Erev Shabbat.
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