Reference for Chullin 39:13

למעוטי מוליך ומביא

- Rather, said R'Jeremiah, it excludes the act of moving to and fro.<span class="x" onmousemove="('comment',' Such movement of the finger.nail, it is assumed, invalidates the nipping, whereas it is essential to do so with the knife in the case of slaughtering. Accordingly the first clause of the rule in our Mishnah is the important one.');">⁵</span>

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