Leviticus 7:22-25

22Then the LORD said to Moses, 23“Speak to the Israelites and say, ‘You are not to eat any of the fat of an ox, a sheep, or a goat. 24The fat of an animal found dead or mauled by wild beasts may be used for any other purpose, but you must not eat it.

25If anyone eats the fat of an animal from which a food offering may be presented to the LORD, the one who eats it must be cut off from his people.