Moses slaughtered the bull, took some of the blood, and applied it with his finger to all four horns of the altar, purifying the altar. He poured out the rest of the blood at the base of the altar and consecrated it so that atonement could be made on it.
The covenant of priesthood must be made by sacrifice, as well as other covenants, Psa 50:5. And thus Christ was consecrated by the sacrifice of himself, once for all. Sacrifices of each kind must be offered for the priests, that they might with the more tenderness and concern offer the gifts and sacrifices of the people, with compassion on the ignorant, and on those that...
Commenting on Leviticus 8:14-30
And he slew it,.... Not Aaron, nor any of his sons, who as yet were not fully consecrated and installed into their office, but Moses, as follows: and Moses took the blood; which was received into a basin when the bullock was slain: and put it upon the horns of the altar round about with his finger; upon the four horns of the altar, which...
And he slew [it]; and Moses took the blood, and put [it] upon the horns of the altar round about with his finger, and purified the altar, and poured the blood at the bottom of the altar, and sanctified it, to make reconciliation upon it. (c) Of the burnt offering. (d) To offer for the sins of the people.