John Gill Commentary Leviticus 22:8

"That which dieth of itself, or is torn of beasts, he shall not eat, to defile himself therewith: I am Jehovah." — Leviticus 22:8 (ASV)

That which dies of itself, or is torn [with beasts] Whether fowls or beasts, and even clean ones, which, had they been killed in a proper manner, were fit to cut, but dying of themselves, or torn to pieces by other birds or beasts of prey, might not, see (Ezekiel 44:31).

he shall not eat, to defile himself with it; being impure food, at least in a ceremonial sense, and not fit to be eaten; these things were forbidden a common Israelite, and much less might a priest eat of them, see (Leviticus 17:15).

I [am] the Lord; who enjoin this, and expect to be obeyed.