Reference for Chullin 34:13

א"ל רב הונא בריה דרב נחמיה לרב אשי

Is it not well known that Raba said: A knife with a mesakseketh is fit for use? - It is no contradiction, for in the one case [the slaughterer] moved the knife forward and backward<span class="x" onmousemove="('comment',' The slaughtering is then invalid.');">⁶</span>

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