Reference for Chullin 64:5

איתיביה רב אחא בר הונא לרבא

but where he first tore away [the windpipe] and then cut [the gullet] we regard it as invalidated by some other defect.<span class="x" onmousemove="('comment',' This is the case of the Mishnah in Chap. III, and the animal is merely trefah, since it was rendered invalid actually before the commencement of the slaughtering.');">³</span>

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