Leviticus 4:28-30

28When he becomes aware of the sin he has committed, he must bring an unblemished female goat as his offering for that sin. 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, 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.