Leviticus 5:6, 9, 12

As a penalty for the sin they have committed, they must bring to the LORD a female lamb or goat from the flock as a sin offering; and the priest shall make atonement for them for their sin.

and is to splash some of the blood of the sin offering against the side of the altar; the rest of the blood must be drained out at the base of the altar. It is a sin offering.

They are to bring it to the priest, who shall take a handful of it as a memorial portion and burn it on the altar on top of the food offerings presented to the LORD. It is a sin offering.