Leviticus 9:8-14

So Aaron came to the altar and slaughtered the calf as a sin offering for himself. His sons brought the blood to him, and he dipped his finger into the blood and put it on the horns of the altar; the rest of the blood he poured out at the base of the altar. On the altar he burned the fat, the kidneys and the long lobe of the liver from the sin offering, as the LORD commanded Moses; the flesh and the hide he burned up outside the camp. Then he slaughtered the burnt offering. His sons handed him the blood, and he splashed it against the sides of the altar. They handed him the burnt offering piece by piece, including the head, and he burned them on the altar. He washed the internal organs and the legs and burned them on top of the burnt offering on the altar.