Leviticus 3:9-11

9Then he must present a gift to the Lord from the peace offering sacrifice: He must remove all the fatty tail up to the end of the spine, the fat covering the entrails, and all the fat on the entrails,

10the two kidneys with the fat on their sinews, and the protruding lobe on the liver (which he is to remove along with the kidneys).

11Then the priest must offer it up in smoke on the altar as a food gift to the Lord.