Reference for Chullin 33:40

שנית הכל שוחטין ולעולם שוחטין בכל שוחטים מאי משנית ליה

[up to palestine], and also on another occasion he made a notch and sent it up; whereupon the authorities sent back word to him: We have been taught in the Mishnah: A SAW.<span class="x" onmousemove="('comment',' I.e., only such notches like the teeth of a saw render the knife unfit for slaughtering.');">²⁰</span>

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