Leviticus 4:8-10

And 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, And 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, As 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.