Leviticus 4:28-30

28or if his sin which he has committed comes to his knowledge, then he shall bring as his offering a kid of the goats, a female without blemish, for his sin which he has committed.

29And he shall lay his hand on the head of the sin offering, and kill the sin offering at the place of the burnt offering.

30Then the priest shall take some of its blood with his finger, put it on the horns of the altar of burnt offering, and pour all the remaining blood at the base of the altar.