Leviticus 16:32-34

32The priest who is anointed and ordained to serve as high priest in place of his father will make atonement. He will put on the linen garments, the holy garments,

33and make atonement for the most holy place. He will make atonement for the tent of meeting and the altar and will make atonement for the priests and all the people of the assembly.

34This is to be a permanent statute for you, to make atonement for the Israelites once a year because of all their sins.” And all this was done as the Lord commanded Moses.