Leviticus 7:3-5

New Living Translation

³ The priest will then offer all its fat on the altar, including the fat of the broad tail, the fat around the internal organs, ⁴ the two kidneys and the fat around them near the loins, and the long lobe of the liver. These are to be removed with the kidneys, ⁵ and the priests will burn them on the altar as a special gift presented to the Lord. This is the guilt offering.