Leviticus 3:9-11

9From the fellowship offering you are to bring a food offering to the LORD : its fat, the entire fat tail cut off close to the backbone, the internal organs and all the fat that is connected to them, 10both kidneys with the fat on them near the loins, and the long lobe of the liver, which you will remove with the kidneys.

11The priest shall burn them on the altar as a food offering presented to the LORD .