Leviticus 4:28-30

28or if someone informs him about the sin he has committed, then he is to bring an unblemished female goat as his offering for the sin that he has committed.

29He is to lay his hand on the head of the sin offering and slaughter it at the place of the burnt offering.

30Then the priest is to take some of its blood with his finger and apply it to the horns of the altar of burnt offering. He is to pour out the rest of its blood at the base of the altar.