Leviticus 3:4-9

4and the two kidneys, and the fat that is on them, which is by the flanks, and the net above the liver which he shall take away as far as the kidneys;

5and Aaron's sons shall burn it on the altar upon the burnt-offering which [lieth] on the wood that is upon the fire: [it is] an offering by fire to Jehovah of a sweet odour.

6And if his offering for a sacrifice of peace-offering to Jehovah be of small cattle, male or female, he shall present it without blemish.

7If he present a sheep for his offering, then shall he present it before Jehovah,

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,