Reference for Chullin 40:22

אמרי

Now he who says: 'Because he thrusts', wherefore does he not say: 'Because he presses [the knife downwards]? - He is of the opinion that to move the finger-nail to and fro whilst nipping is allowed.<span class="x" onmousemove="('comment',' There is, therefore, in this case no pressure upon the organs. vskj vskuj');">¹⁴</span>

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