Leviticus 4:7-12

And the priest shall put some of the blood on the horns of the altar of fragrant incense before the LORD that is in the tent of meeting, and all the rest of the blood of the bull he shall pour out at the base of the altar of burnt offering that is at the entrance of the tent of meeting. And all the fat of the bull of the sin offering he shall remove from it, the fat that covers the entrails and all the fat that is on the entrails and the two kidneys with the fat that is on them at the loins and the long lobe of the liver that he shall remove with the kidneys (just as these are taken from the ox of the sacrifice of the peace offerings); and the priest shall burn them on the altar of burnt offering. But the skin of the bull and all its flesh, with its head, its legs, its entrails, and its dung— all the rest of the bull—he shall carry outside the camp to a clean place, to the ash heap, and shall burn it up on a fire of wood. On the ash heap it shall be burned up.