Leviticus 7:1-5

“This is the law of the guilt offering. It is most holy. In the place where they kill the burnt offering they shall kill the guilt offering, and its blood shall be thrown against the sides of the altar. And all its fat shall be offered, the fat tail, the fat that covers the entrails, the two kidneys with the fat that is on them at the loins, and the long lobe of the liver that he shall remove with the kidneys. The priest shall burn them on the altar as a food offering to the LORD; it is a guilt offering.