Ezekiel 43:20
You shall take of its blood and put it on its four horns, and on the four corners of the ledge, and on the border all around. You shall cleanse it and make atonement for it that way.
World English Bible (Public Domain)
In context
Before · Ezekiel 43:18–19
18He said to me, “Son of man, the Lord GOD says: ‘These are the ordinances of the altar in the day when they make it, to offer burnt offerings on it, and to sprinkle blood on it. 19You shall give to the Levitical priests who are of the offspring of Zadok, who are near to me, to minister to me,’ says the Lord GOD, ‘a young bull for a sin offering.
20You shall take of its blood and put it on its four horns, and on the four corners of the ledge, and on the border all around. You shall cleanse it and make atonement for it that way.
After · Ezekiel 43:21–22
21You shall also take the bull of the sin offering, and it shall be burned in the appointed place of the house, outside of the sanctuary. 22“On the second day you shall offer a male goat without defect for a sin offering; and they shall cleanse the altar, as they cleansed it with the bull.