John Gill Commentary Leviticus 4:35

"and all the fat thereof shall he take away, as the fat of the lamb is taken away from the sacrifice of peace-offerings; and the priest shall burn them on the altar, upon the offerings of Jehovah made by fire; and the priest shall make atonement for him as touching his sin that he hath sinned, and he shall be forgiven." — Leviticus 4:35 (ASV)

(See Gill on Leviticus 4:34).