Leviticus 7:24

And the fat of the beast that dieth of itself
Of any disease, and is not regularly killed:

and the fat of that which is torn with beasts;
with wild beasts:

may be used in any other use;
as in medicine, for plasters, or for making candles, or for greasing of anything to make it smooth and pliable, or the like:

but ye shall in no wise eat of it;
such carcasses themselves were not to be eaten of, and one would think their fat in course must be unlawful; but however, to prevent the doing of it, this particular law was given, and those that broke this were doubly guilty, as the Jews observe ^F13; once in eating things that died of themselves, or were torn with beasts, and again by eating the fat of them.

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FOOTNOTES:

F13 Maimon. Hilchot Maacolot Asurot, c. 7. sect. 2.