Leviticus 9:8-11

8So Aaron came to the altar and slaughtered the calf as a sin offering for himself. 9His 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. 10On the altar he burned the fat, the kidneys and the long lobe of the liver from the sin offering, as the Lord commanded Moses; 11the flesh and the hide he burned up outside the camp.