Reference for Niddah 144:5

הרואה ראייה אחת של זוב ב"ש אומרים

As to couches and seats occupied between a first and a second discharge, Beth Shammai hold them in suspense and Beth Hillel declare them clean. Now in the first clause it was stated, 'If a man observed one discharge of <i>zibah</i>, Beth Shammai ruled: He is like a woman who waits a day for a day', from which it is evident, is it not, that in the case of a woman who waits a day for a day the uncleanness is held in suspense?<span class="x" onmousemove="('comment',' And if she experiences no second discharge she is clean. ');">⁵</span>

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