Leviticus 7:1-5

1 "'This is the law of the trespass offering. It is most holy.  2 In the place where they kill the burnt offering, he shall kill the trespass offering; and its blood he shall sprinkle on the altar round about.  3 He shall offer all of its fat: the fat tail, and the fat that covers the innards,  4 and the two kidneys, and the fat that is on them, which is by the loins, and the cover on the liver, with the kidneys, shall he take away;  5 and the priest shall burn them on the altar for an offering made by fire to Yahweh: it is a trespass offering.