Reference for Chullin 16:35

גזירה שמא ידיח חלבים ואח"כ בשר

If so, why not apprehend the same even when the loins lie in their natural position, namely, that the fat [upon the loins] will run and will be absorbed by the flesh [of the loins]? - There is a membrane underneath [the fat of the loins] which separates it [from the flesh of the loins].

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