שלחו מתם הזהרו במנהג אבותיכפ look at the second day yom tov when currently we know the calculations and we still keep it as we are afraid that a wicked kingdom might make us forget it. דזימנן דגזרו המלכות גזירה ואתי לקלקלי. The Chasan Sofer says that to follow a minhag, a custom is so important that it can break a heavenly decree.
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