Reference for Niddah 126:31

דר"ג ברבי כרשב"ג סבירא ליה

SHE HAD THE HABIT OF OBSERVING HER MENSTRUAL DISCHARGES AT SUNRISE SHE IS FORBIDDEN INTERCOURSE AT SUNRISE ONLY.<span class="x" onmousemove="('comment',' But is permitted it during the preceding night and, if no discharge appeared at sunrise, during all that day also. ');">²⁵</span>

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