Reference for Chullin 5:2

אלא דאיטמי בשרץ

The slaughterer therefore, being a primary source of uncleanness, would defile the knife, and the knife in turn would defile the flesh!<span class="x" onmousemove="('comment',' The knife would itself assume the same degree of uncleanness as the unclean person, and would thus be a primary source of uncleanness; the flesh touching the knife would then become unclean in the first degree. vtnuyv ct');">²</span>

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