Mesorat%20hashas for Chullin 249:31

א"ר אבין ואיתימא ר' יוסי בר אבין אף אנן נמי תנינא

Abaye said: In fact [I maintain that] the marrow within [the bone] can restore [the flesh] outside it, but h we are dealing with a bone which was sawn through [transversely],<span class="x" onmousemove="('comment',' In which case there is no hope of the limb being restored by the formation of new marrow and flesh. Hence as there is not an olive's bulk of marrow now in the bone, neither is there any prospect for the bone to form new marrow, it cannot convey uncleanness by overshadowing.');">¹⁶</span>

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