Leviticus 4:8-10

8And he shall take off from it all the fat of the bullock for the sin offering; 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 flanks, and the caul above the liver, with the kidneys, it shall he take away,

10As it was taken off from the bullock of the sacrifice of peace offerings: and the priest shall burn them upon the altar of the burnt offering.