Reference for Chullin 143:19

ותימא לה לחיה

And R'Akiba? - He maintains that the [dead] foetus whilst yet in the womb of its mother is unclean.<span class="x" onmousemove="('comment',' And as R. Akiba does not regard the uncleanness of the covering stone and supporting stones as established by tradition he derives it expressly from the above verse.');">¹³</span>

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