Leviticus 7:2-4

Revised Standard Version

² in the place where they kill the burnt offering they shall kill the guilt offering, and its blood shall be thrown on the altar round about. ³ And all its fat shall be offered, the fat tail, the fat that covers the entrails, ⁴ the two kidneys with the fat that is on them at the loins, and the appendage of the liver which he shall take away with the kidneys;