Leviticus 16:18-19
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18Then he shall go out to the altar that is before the Lord and make atonement for it; he shall take some of the blood from the bull and some of the blood from the goat, and put it on the horns of the altar on all sides. 19With his finger he shall sprinkle some of the blood on it seven times and cleanse it, and consecrate it from the impurities of the sons of Israel.