Lev 16:31-34

31It is a sabbath of complete rest to you, and you shall deny yourselves; it is a statute forever.32The priest who is anointed and consecrated as priest in his father's place shall make atonement, wearing the linen vestments, the holy vestments.33He shall make atonement for the 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.34This shall be an everlasting statute for you, to make atonement for the people of Israel once in the year for all their sins. And Moses did as the Lord had commanded him.