Leviticus 4:33-34

MSB(i) 33 And he is to lay his hand on the head of the sin offering and slaughter it as a sin offering at the place where the burnt offering is slaughtered. 34 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.