Leviticus 4:32-35

And if he bring a lamb for a sin offering, he shall bring it a female without blemish. And he shall lay his hand upon the head of the sin offering, and slay it for a sin offering in the place where they kill the burnt offering. And the priest shall take of the blood of the sin offering with his finger, and put it upon the horns of the altar of burnt offering, and shall pour out all the blood thereof at the bottom of the altar: and he shall take away all the fat thereof, as the fat of the lamb is taken away from the sacrifice of the peace offerings; and the priest shall burn them upon the altar, according to the offerings made by fire unto the LORD: and the priest shall make an atonement for his sin that he hath committed, and it shall be forgiven him.