Then the priest is to take some of the blood of the sin offering with his finger, put it on the horns of the altar of burnt offering, and pour out the rest of its blood at the base of the altar.

Leviticus 4:7
The priest must then put some of the blood on the horns of the altar of fragrant incense that is before the LORD in the Tent of Meeting. And he is to pour out the rest of the bull's blood at the base of the altar of burnt offering at the entrance to the Tent of Meeting.

Leviticus 4:18
He is also to put some of the blood on the horns of the altar that is before the LORD in the Tent of Meeting, and he must pour out the rest of the blood at the base of the altar of burnt offering at the entrance to the Tent of Meeting.

And the priest shall take of the blood of the sin offering with his finger, and put it on the horns of the altar of burnt offering, and shall pour out all the blood thereof at the bottom of the altar: