Leviticus 3:2-5

2And he shall lay his hand upon the head of his oblation, and kill it at the door of the tent of meeting: and Aaron’s sons the priests shall sprinkle the blood upon the altar round about.

3And he shall offer of the sacrifice of peace offerings an offering made by fire unto the LORD; the fat that covereth the inwards, and all the fat that is upon the inwards,

4and the two kidneys, and the fat that is on them, which is by the loins, and the caul upon the liver, with the kidneys, shall he take away.

5And Aaron’s sons shall burn it on the altar upon the burnt offering, which is upon the wood that is on the fire: it is an offering made by fire, of a sweet savour unto the LORD.