Reference for Chullin 141:32

אחת זו ואחת זו עד לכלב שפיר

Now according to R'Johanan it is well,<span class="x" onmousemove="('comment',' And the principle that an unclean object that has been swallowed cannot render unclean is indeed to be derived from the above quoted verse.');">²⁰</span>

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