Leviticus 4:3, 12, 21

if the anointed priest sins, bringing guilt on the people, then let him offer to the LORD for his sin which he has sinned a young bull without blemish as a sin offering.

the whole bull he shall carry outside the camp to a clean place, where the ashes are poured out, and burn it on wood with fire; where the ashes are poured out it shall be burned.

Then he shall carry the bull outside the camp, and burn it as he burned the first bull. It is a sin offering for the assembly.