Reference for Chullin 231:26

חיה דאורייתא ור' עקיבא סבר

- R'Akiba is of the opinion that a prohibition can be superimposed upon an existing prohibition; therefore no specific verse is necessary [to show that the prohibition of flesh in milk applies to] forbidden fat or [to the flesh of an animal] that died of itself; moreover [the prohibition naturally applies to an embryo [for it] IS as an ordinary kid; consequently all the expressions are Superfluous and serve therefore to exclude wild animals, fowl and unclean animals.

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