Reference for Bekhorot 74:62

כרשינה הנכנסת ויוצאה או כרשינה העומדת

the size<span class="x" onmousemove="('comment',' So as to bring uncleanness from one house to the other. As this was not made by the agency of a man, therefore less than this size does not bring about impurity.');">²⁷</span>

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