Leviticus 4:16-18

16Then the high priest must bring some of the blood of the bull to the Meeting Tent,

17and that priest must dip his finger in the blood and sprinkle some of the blood seven times before the Lord toward the front of the veil-canopy.

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