Leviticus 16:27-30

²⁷And the bullock for the sin-offering, and the goat for the sin-offering, the blood of which was brought in to make atonement in the holy place, shall one carry forth without the camp; and they shall burn in fire their skins, and their flesh, and their dung.

²⁸And he that burneth them shall wash his clothes, and bathe his flesh in water, and afterward he may come into the camp.

²⁹And it shall be unto you a statute for ever: in the seventh month, on the tenth of the month, ye shall afflict yourselves by fasting, and no work shall ye do, whether it be one of your own country, or the stranger that sojourneth among you;

³⁰For on that day shall the high-priest make an atonement for you, to cleanse you; from all your sins before the Lord shall ye be clean.