Shall burn them, i.e. the fat; but he useth the plural number, because the fat was of several kinds, as we saw Leviticus 4:8,9. According to the offerings made by fire; Heb. upon the offerings, together with them, or after them; because the burnt-offerings were to have the first place. See Poole on "Leviticus 3:5".
Related Commentaries of Leviticus 4:35
Leviticus 4:35
35 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.