Reference for Chullin 72:40

ודלמא כדרב יהודה אמר שמואל דאמר רב יהודה אמר שמואל

[But this also cannot be the case] for R'Jose B'Hanina taught that the liquids in the slaughterhouse [of the Temple court] are not only clean but will not even render any food susceptible to uncleanness.

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