Reference for Chullin 39:14

הניחא למ"ד

This is well, however, according to the one who holds that to move [the fingernail] to and fro whilst nipping is not allowed; but according to the one who holds that it is allowed, how is it to be explained? - The sons of R'Hiyya agree with him who holds that to move the fingernail to and fro whilst nipping is not allowed.

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