Can one rinse out the kiddush cup on Shabbos to prepare for the mitzvah of havdalah, or this is considered preparing for the weekday which is forbidden?


If it is clear that the kiddush cup won’t be used until after Shabbos, it should not be rinsed on Shabbos.

Sources: Mishnah Berurah (323:29, based on Magen Avraham) writes that this would be “forbidden,” whereas Aruch Hashulchan (323:7) writes that it is “improper.”

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