Reference for Niddah 135:26
זבה ודאי ולוי אמר
BUT THE SAGES RULED: EVEN IF SHE EXAMINED HERSELF ON THE SECOND DAY OF HER MENSTRUATION AND FOUND THAT SHE WAS CLEAN, AND AT TWILIGHT SHE DID NOT ASCERTAIN HER SEPARATION, AND AFTER A TIME SHE EXAMINED HERSELF AND FOUND THAT SHE WAS UNCLEAN, SHE IS REGARDED AS BEING IN A PRESUMPTIVE STATE OF CLEANNESS.<span class="x" onmousemove="('comment',' The examination on the second day being sufficient to establish a presumptive cleanness. ');"><sup>23</sup></span>
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