Reference for Niddah 135:23

וחכמים אומרים

CONVEYS, HOWEVER, UNCLEANNESS FOR TWENTY-FOUR HOURS RETROSPECTIVELY OR DURING THE TIME BETWEEN THE LAST AND THE PREVIOUS EXAMINATION, BUT IF SHE HAD A SETTLED PERIOD, IT SUFFICES FOR HER TO BE DEEMED UNCLEAN FROM THE TIME OF HER DISCHARGE. R.<span class="x" onmousemove="('comment',' V. margl. gl. Cur. edd., 'and R.' ');">²⁰</span>

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