Leviticus 9:8-11

8And Aaron went to the altar and slaughtered 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 bottom of the altar.

10And the fat, and the kidneys, and the net above the liver, of the sin-offering, he burned on the altar, as Jehovah had commanded Moses.

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