Charles Ellicott Commentary Leviticus 4:25

"And the priest shall take of the blood of the sin-offering with his finger, and put it upon the horns of the altar of burnt-offering; and the blood thereof shall he pour out at the base of the altar of burnt-offering." — Leviticus 4:25 (ASV)

And the priest shall take.—Here, again, the difference in the ritual is to be observed. In case of his own sin offering and in that of the congregation, the high priest himself performed the principal ceremony (Leviticus 4:5–17), while at the sin offering of the prince the common priest officiated. The blood of the victim was not sprinkled before the veil of the Holy of Holies, nor on the incense altar which stood in the Holy, but on the brazen altar which was placed outside in the court.