Leviticus 7:4-6

⁴And the two kidneys, and the fat that is on them, which is by the flanks, and the caul that is above the liver, with the kidneys, it shall he take away:

⁵And the priest shall burn them upon the altar for an offering made by fire unto the LORD: it is a trespass offering.

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