Leviticus 7:4-6

⁴and the two kidneys, and the fat that is on them, which is by the loins, and the lobe above the liver, which he shall take away by the kidneys.

⁵And the priest shall make them smoke upon the altar for an offering made by fire unto the LORD; it is a guilt-offering.

⁶Every male among the priests may eat thereof; it shall be eaten in a holy place; it is most holy.