Reference for Niddah 70:53

תא שמע

— It was necessary to state it for the sake of Beth Shammai: Although Beth Shammai maintain that there is only one source and that the All Merciful had ordained the uncleanness to be dependent entirely on the lapse of the prescribed number of days,<span class="x" onmousemove="('comment',' Sc. that the discharge after these unclean days have passed becomes naturally clean. ');">⁵¹</span>

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