Reference for Rosh Hashanah 59:13

בעי ר' זירא ננערו לעמוד ולא עמדו מהו ב"ד יושבין בעינן והא איכא או דלמא זמן ב"ד בעינן וליכא תיקו:

and women are not liable to perform any duties for which there is a specific time? What it therefore must mean is, every man in this house', and even [I presume] during the hours when the Beth din does not sit? - No; it means in fact during the hours when the Beth din does sit.

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