Albert Barnes Commentary Leviticus 4:7

"And the priest shall put of the blood upon the horns of the altar of sweet incense before Jehovah, which is in the tent of meeting; and all the blood of the bullock shall he pour out at the base of the altar of burnt-offering, which is at the door of the tent of meeting." — Leviticus 4:7 (ASV)

Pour - All the blood that was left after the sprinkling and the smearing should be disposed of in such a manner as to suit the decorum of divine service. It had no sacrificial significance.