Leviticus 9:18-21

18Aaron killed the bull and the male sheep. These were friendship offerings from the people. The priests brought the blood to him. He threw it onto the sides of the altar.

19Aaron took the fat tail, the fat and the kidneys and the best piece of the liver.

20He put them on the meat of the animal's ribs. Then he burnt the fat on the altar.

21Aaron lifted up the meat as an offering to the Lord. Moses had told him that he must do this.