Leviticus 9:8-11

8So Aaron drew near to the altar and killed the calf of the sin offering, which was for himself.

9And the sons of Aaron presented the blood to him, and he dipped his finger in the blood and put it on the horns of the altar and poured out the blood at the base of the altar.

10But the fat and the kidneys and the long lobe of the liver from the sin offering he burned on the altar, as the Lord commanded Moses.

11The flesh and the skin he burned up with fire outside the camp.