Quotation for Menachot 131:12
דרבי ישמעאל ור' יהודה בן בתירא לית להו פירכא
Rashi on Leviticus
תמימת תהיינה [SEVEN WEEKS] SHALL BE COMPLETE — This teaches that one has to begin counting in the evening, for otherwise they would not be complete (Menachot 66a).
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