Leviticus 7:3

“‘This is the law of the trespass offering: It is most holy.

In the place where they kill the burnt offering, he shall kill the trespass offering; and its blood he shall sprinkle around on the altar.

and he shall take away the two kidneys, and the fat that is on them, which is by the loins, and the cover on the liver, with the kidneys;

and the priest shall burn them on the altar for an offering made by fire to the LORD: it is a trespass offering.

Every male among the priests may eat of it. It shall be eaten in a holy place. It is most holy.