Reference for Bekhorot 50:52

ורבי חייא בר אבא מאי טעמא לא אמר כר' אסי

once they have been examined, is it a usual thing that a blemish should occur in them?<span class="x" onmousemove="('comment',' And in such circumstances, the first Tanna mentioned above would not have prohibited.');">²⁶</span>

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