Reference for Chullin 141:26

דכתיב

<big><b>GEMARA: </b></big>Rabbah said: Just as an unclean object that has been swallowed cannot render unclean,<span class="x" onmousemove="('comment',' E.g., the dead foetus (that is 'swallowed' or enclosed) in the womb of its mother does not render the mother unclean; v. our MISHNAH:');">¹⁵</span>

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