Leviticus 3:8-9

⁸and he shall lay his hand on the head of his offering, and kill it before the Tent of Meeting. Aaron’s sons shall sprinkle its blood around on the altar.

⁹He shall offer from the sacrifice of peace offerings an offering made by fire to Yahweh; its fat, the entire tail fat, he shall take away close to the backbone; and the fat that covers the entrails, and all the fat that is on the entrails,