Leviticus 9:8

They brought what Moses commanded before the Tent of Meeting. All the congregation came near and stood before the LORD.

Moses said, “This is the thing which the LORD commanded that you should do; and the LORD’s glory shall appear to you.”

Moses said to Aaron, “Draw near to the altar, and offer your sin offering, and your burnt offering, and make atonement for yourself, and for the people; and offer the offering of the people, and make atonement for them, as the LORD commanded.”

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;

but the fat, and the kidneys, and the cover from the liver of the sin offering, he burned upon the altar, as the LORD commanded Moses.

The meat and the skin he burned with fire outside the camp.