Leviticus 4:28-30

28and the sin they have committed becomes known, they must bring as their offering for the sin they committed a female goat without defect.

29They are to lay their 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 the blood with his finger and 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.