Leviticus 4:30

4:30 Then the priest must take some of its blood with his finger and put it on the horns of the altar of burnt offering, and he must pour out all the rest of its blood at the base of the altar.

Leviticus 9:9

9:9 Then Aaron’s sons presented the blood to him and he dipped his finger in the blood and put it on the horns of the altar, and the rest of the blood he poured out at the base of the altar.