Leviticus 7:2-5

2in the place where they slaughter the burnt-offering shall they slaughter the trespass-offering; and the blood thereof shall he sprinkle on the altar round about.

3And he shall present of it all the fat thereof; the fat tail and the fat that covereth the inwards,

4and the two kidneys, and the fat that is on them, which is by the flanks, and the net above the liver, which he shall take away as far as the kidneys.

5And the priest shall burn them on the altar, an offering by fire to Jehovah: it is a trespass-offering.