Leviticus 3:8-9

⁸And he shall lay his hand upon the head of his offering, and kill it before the tabernacle of the congregation: and the sons of Aaron shall sprinkle its blood upon the altar round about.

⁹And he shall offer the sacrifice of the peace-offering, as a fire-offering unto the Lord, the best part thereof, the whole rump, hard by the backbone shall he take it off; and the fat that covereth the inwards, and all the fat that is upon the inwards;