Leviticus 4:8-10

He shall remove from it all the fat of the bull of the sin offering: the fat that covers the entrails, and all the fat which is on the entrails, and the two kidneys with the fat that is on them, which is on the loins, and the lobe of the liver, which he shall remove with the kidneys (just as it is removed from the ox of the sacrifice of peace offerings), and the priest is to offer them up in smoke on the altar of burnt offering.