Commentary for Niddah 78:15

אשה קובעת לה וסת בתוך ימי נדותה אלמא מריש ירחא מנינא

so that when the twenty-second day comes round again the woman is within the days of her menstruation period?<span class="x" onmousemove="('comment',' The twenty-two days consisting of 7 (menstruation) + 11 (zibah) + 4 (of the seven of the present menstruation period) days. ');">¹⁵</span>

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