Leviticus 3:8-9

8and shall lay his hand on the head of his offering, and slaughter it before the tent of meeting; and Aaron's sons shall sprinkle the blood thereof upon the altar round about.

9And he shall present of the sacrifice of peace-offering an offering by fire to Jehovah; the fat thereof, the whole fat tail, which he shall take off close by the backbone, and the fat that covereth the inwards, and all the fat that is on the inwards,