Reference for Chullin 31:14

האי מאן דכפתיה לחבריה ואשקיל עליה בידקא דמיא ומית חייב מ"ט

Rab was once sitting behind R'Hiyya whilst R'Hiyya was before Rabbi, when Rabbi, in session, expounded the following: Whence is it derived that the slaughtering must be performed with a detached implement?

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