Reference for Chullin 140:25

אי לאו דר' יצחק הוה אמינא

It was taught: R'Jonathan said: I said to Ben 'Azzai: We have learnt that the carcass of clean cattle conve uncleanness, that the carcass of unclean cattle conveys uncleanness, and that the carcass of unclean wild animals conveys uncleanness; but we have not learnt it about the carcass of clean wild animals.

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