Reference for Chullin 218:14

אינו עובר עליו מיעבר הוא דלא עבר הא איסורא איכא

Now only the heart must be cut open [after the cooking] but the udder need not be cut open at all! - Perhaps the inference is: only for the heart does the cutting open [after the cooking] suffice, but for the udder the cutting open [after the cooking] would not be sufficient.

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