Reference for Niddah 5:40

אמר אביי

also, since there are creeping things from the alley itself and also creeping things that make their way into it from the outside world, the case is the same as one that has two unfavourable factors. And if you prefer I might reply,<span class="x" onmousemove="('comment',' To the objection raised against Shammai. ');">³⁶</span>

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