Leviticus 16:18

Then he must go out to the altar that is before the LORD and make atonement for it. He must take some of the bull's blood and some of the goat's blood. He must put it on all the horns of the altar.

Leviticus 16:18, Readable English Bible (READ)

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Previous · Leviticus 16:17Aaron will go in to make atonement in the Most Holy Place. No one may be in the Tent of Meeting from the time he goes in until he comes out. He will have made… Next · Leviticus 16:19With his finger he must sprinkle some of the blood on the altar seven times. This will make it clean and holy again from the uncleanness of the Israelites.