Leviticus 4:6-7

6The priest shall dip his finger in the blood and sprinkle some of the blood seven times before the Lord, in front of the veil of the sanctuary.

7And the priest shall put some of the blood on the horns of the altar of sweet incense before the Lord, which is in the tabernacle of meeting; and he shall pour the remaining blood of the bull at the base of the altar of the burnt offering, which is at the door of the tabernacle of meeting.