Reference for Chullin 34:29

לא אמרו להראות סכין לחכם אלא מפני כבודו של חכם

Rabina said to R'Ashi: R'Sama the son of R'Mesharsheya told us in your name that you said to him in the name of Raba that it must be examined with the flesh and the nail on the three edges.

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