Leviticus 4:8-10

8And he shall take off from it all the fat of the bull 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 fat above the liver, with the kidneys, that shall he take away,

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