Leviticus 7:23-31

²³“Say this to the Israeli people: Do not eat any of the fat of cattle or sheep or goats.

²⁴The fat of an animal that is found dead or that has been killed by a wild animal may be used for other purposes, but you must not eat it.

²⁵Anyone who eats the fat of an animal from which an offering has been made to Yahweh must no longer be allowed to associate with God's people.

²⁶And wherever you live, you must not eat the blood of any bird or animal.

²⁷If anyone eats blood, he must no longer be allowed to associate with God's people.”

²⁸Yahweh also said to Moses/me,

²⁹“Tell the Israeli people this: Anyone who brings an offering to maintain fellowship with Yahweh must bring part of it to be a sacrifice to Yahweh.

³⁰He himself must bring the offering that will be burned in the fire. He must bring the fat along with the breast of the animal and lift it up in front of Yahweh to indicate that it is an offering to him.

³¹The Supreme Priest must burn the fat on the altar, but the breast belongs to Aaron and all his sons.