Leviticus 9:12
And he slew the burnt offering; and Aaron’s sons presented unto him the blood, which he sprinkled round about upon the altar. And he slew the burnt offering; and Aaron’s sons presented unto him the blood, which he sprinkled round about upon the altar.
This act took place during the priestly service on the eighth day after the dedication of the tabernacle. In that service Aaron's sons handed to him the blood of the burnt offering. He then sprinkled that blood round about upon the altar, doing exactly as God had commanded. When the sacrifices, including this burnt offering, were completed, God accepted them. He revealed His glory by sending fire to consume the offering upon the altar.