Leviticus 8:11
And he sprinkled thereof upon the altar seven times, and anointed the altar and all his vessels, both the laver and his foot, to sanctify them. And he sprinkled thereof upon the altar seven times, and anointed the altar and all his vessels, both the laver and his foot, to sanctify them.
The act belongs to the solemn consecration of Aaron to the office of high priest. The altar was sprinkled seven times and, together with all its vessels and the laver with its base, was anointed to sanctify each for sacred use. That anointing of the altar and its furnishings formed an integral part of setting Aaron apart for his priestly ministry.