Leviticus 3:8-9

⁸And he shall lay his hand upon the head of his offering, and kill it before the tent of meeting; and Aaron's sons shall dash the blood thereof against the altar round about.

⁹And he shall present of the sacrifice of peace-offerings an offering made by fire unto the LORD: the fat thereof, the fat tail entire, which he shall take away hard by the rump-bone; and the fat that covereth the inwards, and all the fat that is upon the inwards,