Leviticus 16:25-16:34

The fat of the sin offering he shall turn into smoke on the altar. He who set the Azazel-goat free shall wash his clothes and bathe his body in water; after that he may reenter the camp. The bull of sin offering and the goat of sin offering whose blood was brought in to purge the Shrine shall be taken outside the camp; and their hides, flesh, and dung shall be consumed in fire. He who burned them shall wash his clothes and bathe his body in water; after that he may re-enter the camp. And this shall be to you a law for all time: In the seventh month, on the tenth day of the month, you shall practice self-denial; and you shall do no manner of work, neither the citizen nor the alien who resides among you. For on this day atonement shall be made for you to cleanse you of all your sins; you shall be clean before the Lord. It shall be a sabbath of complete rest for you, and you shall practice self-denial; it is a law for all time. The priest who has been anointed and ordained to serve as priest in place of his father shall make expiation. He shall put on the linen vestments, the sacral vestments. He shall purge the innermost Shrine; he shall purge the Tent of Meeting and the altar; and he shall make expiation for the priests and for all the people of the congregation. This shall be to you a law for all time: to make atonement for the Israelites for all their sins once a year. And Moses did as the Lord had commanded him.