You shall take some of its blood and put it on the four horns of the altar, on the four corners of the ledge, and on the rim around it; thus you shall cleanse it and make atonement for it.
Ezekiel 43:20
Surrounding context
43:19 You shall give a young bull for a sin offering to the priests, the Levites, who are of the seed of Zadok, who approach Me to minister to Me,' says the Lord GOD.
43:20 You shall take some of its blood and put it on the four horns of the altar, on the four corners of the ledge, and on the rim around it; thus you shall cleanse it and make atonement for it.
43:21 Then you shall also take the bull of the sin offering, and burn it in the appointed place of the temple, outside the sanctuary.