Leviticus 7:3-5

New King James Version

³ And he shall offer from it all its fat. The fat tail and the fat that covers the entrails, ⁴ the two kidneys and the fat that is on them by the flanks, and the fatty lobe attached to the liver above the kidneys, he shall remove; ⁵ and the priest shall burn them on the altar as an offering made by fire to the Lord. It is a trespass offering.