Related for Rosh Hashanah 44:16

למימרא דאחסר עבדינן אמלא לא עבדינן מ"ט א"ר זירא גזירה משום ר"ח חסר שחל להיות בערב שבת אימת עבדי באפוקי שבתא דאי אמרת נעביד נמי אמלא אתו

This means to say that we light beacons for defective months but not for full months. What is the reason? - R'Zera said: It is a precaution on account of a defective month which ends on Friday. [In that case] when do we light? On the termination of Sabbath; and if you were to insist that we should light up also for full months, this might give rise

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