Leviticus 3:9-11

9Then from the sacrifice of the peace offering he shall offer as a food offering to the Lord its fat; he shall remove the whole fat tail, cut off close to the backbone, and the fat that covers the entrails and all the fat that is on the entrails

10and 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.

11And the priest shall burn it on the altar as a food offering to the Lord.