Leviticus 16:31

28 He who burns them shall wash his clothes, and bathe his flesh in water, and afterward he shall come into the camp.

29 It shall be a statute forever to you: in the seventh month, on the tenth day of the month, you shall afflict your souls, and shall do no manner of work, the home-born, or the stranger who sojourns among you:

30 for on this day shall atonement be made for you, to cleanse you; from all your sins shall you be clean before Yahweh.

31 It is a Sabbath of solemn rest to you, and you shall afflict your souls; it is a statute forever.

32 The priest, who shall be anointed and who shall be consecrated to be priest in his father`s place, shall make the atonement, and shall put on the linen garments, even the holy garments:

33 and he shall make atonement for the holy sanctuary; and he shall make atonement for the tent of meeting and for the altar; and he shall make atonement for the priests and for all the people of the assembly.

34 This shall be an everlasting statute to you, to make atonement for the children of Israel because of all their sins once in the year. He did as Yahweh commanded Moses.