The Altar of Burnt-Offering: The Blood of Sacrifices Put on the Horns and Poured at The
Source: TTT
Exodus 29:12
Take some of the blood of the bull and put it on the horns of the altar with your finger; then pour out the rest of the blood at the base of the altar.
Leviticus 4:7, 18, 25
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. / 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. / 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 the blood at the base of the altar.
Leviticus 8:15
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.