Leviticus 4:8-10

8And all the fat of the bullock of the sin offering he shall take off from it; the fat that covereth the inwards, and all the fat that is upon the inwards,

9and the two kidneys, and the fat that is upon them, which is by the loins, and the caul upon the liver, with the kidneys, shall he take away,

10as it is taken off from the ox of the sacrifice of peace offerings: and the priest shall burn them upon the altar of burnt offering.