Leviticus 4:16-18

16Then the anointed priest is to bring some of the bull’s blood into the Tent of Meeting, 17and he is to dip his finger in the blood and sprinkle it seven times before the LORD in front of the veil. 18He is also to put some of the blood on the horns of the altar that is before the LORD in the Tent of Meeting, and he must pour out the rest of the blood at the base of the altar of burnt offering at the entrance to the Tent of Meeting.