Leviticus 8:14-17

Then he brought the bull of the sin offering, and Aaron and his sons laid their hands on the head of the bull of the sin offering. And he killed it, and Moses took the blood, and with his finger put it on the horns of the altar around it and purified the altar and poured out the blood at the base of the altar and consecrated it to make atonement for it. And he took all the fat that was on the entrails and the long lobe of the liver and the two kidneys with their fat, and Moses burned them on the altar. But the bull and its skin and its flesh and its dung he burned up with fire outside the camp, as the LORD commanded Moses.