Reference for Niddah 111:66

תניא נמי הכי רבי יוסי אומר

or is it possible that it is in the presumptive state of having been properly swept?<span class="x" onmousemove="('comment',' So that if any unclean object had been there at the time it would have been swept away. ');">⁴⁹</span>

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