Leviticus 4:17-18

17Then the kohen is to dip his finger in the blood, and sprinkle it seven times before Adonai, before the curtain.

18He is to put some of the blood on the horns of the altar that is before Adonai, in the Tent of Meeting, and the rest of the blood he is to pour out at the base of the altar of burnt offering, which is at the entrance of the Tent of Meeting.