Thou shalt cleanse the altar, when thou hast made an atonement for it. — Rather, by making an atonement for it. The atonement was made by smearing the blood of the bullock upon the horns of the altar (Exodus 29:12, compared with Leviticus 8:15).
And thou shalt anoint it. — Comp. Leviticus 8:11, where we find that the altar was anointed by having the holy oil sprinkled upon it seven times. It is not quite clear at what period in the ceremonial this was done.