Reference for Chullin 114:4

לא סבר לה מר הא דאמר רב הונא אמר רב

and he replied. "I know only of the Mishnah: If the hind legs of an animal were cut off below the knee joint it is permitted, above the knee joint it is trefah; similarly, if the juncture of the tendons was gone it is trefah.

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