Reference for Chullin 202:23

מתיב רבא

R'Aha the son of Raba said to R'Ashi: Then it should be prohibited from that time<span class="x" onmousemove="('comment',' I.e., from the time that they were first designated 'children of Israel', that is, when Jacob was taken to Egypt.');">¹⁴</span>

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