Reference for Niddah 5:38

קמ"ל כל הנשים

or to such time as it was last swept?<span class="x" onmousemove="('comment',' Infra 56a; and no creeping thing was found. The sweeping, which is presumably accompanied by a search for any unclean things, has the same force as a direct examination. Hence (cf. prev. n.) only objects that were in the alley prior to the sweeping are clean while those that were there after the sweeping, since a creeping thing may have fallen into the alley immediately after the sweeping was over, are regarded as unclean. Now seeing that here uncleanness in a doubtful case is caused retrospectively, why does Shammai in our Mishnah restrict the period of uncleanness to the time of THEIR DISCOVERING only? ');">³⁴</span>

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