Leviticus 7:4-6

⁴and 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;

⁵and the priest shall burn them on the altar for an offering made by fire to the LORD: it is a trespass offering.

⁶Every male amongst the priests may eat of it. It shall be eaten in a holy place. It is most holy.