Reference for Keritot 4:46

כ"ד אבות נזיקין

Likewise here [argue in a similar manner]: Just as 'his sister' is distinguished in that it is a relation which can never be permitted in the lifetime of the man who renders her forbidden,<span class="x" onmousemove="('comment',' I.e., she always remains forbidden to the brother.');">³⁴</span>

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