Leviticus 4:8-19, 26, 31

He shall remove all the fat from the bull of the sin offering—the fat that covers the entrails, and all the fat which is on the entrails, and the two kidneys with the fat that is on them at the loins, and the lobe of the liver, which he shall remove with the kidneys (just as these are removed from the ox of the sacrifice of peace offerings), and the priest is to offer them up in smoke on the altar of burnt offering. But the hide of the bull and all its meat, with its head, its legs, its entrails, and its refuse, that is, all the rest of the bull, he is to bring outside the camp to a clean place where the ashes are poured out, and burn it on a fire of wood. Where the ashes are poured out it shall be burned. [Heb 13:11-13] ‘Now if the whole congregation of Israel sins unintentionally, and the matter escapes the notice of the assembly, and they have done any one of the things which the LORD has commanded not to be done, and they become guilty; when the sin which they have committed becomes known, then the congregation shall offer a young bull of the herd as a sin offering and bring it before the Tent of Meeting. Then the elders of the congregation shall lay their hands on the head of the bull before the LORD [to transfer symbolically the congregation’s guilt to the sacrifice], and they shall kill the bull before the LORD. The anointed priest is to bring some of the bull’s blood to the Tent of Meeting, and the priest shall dip his finger in the blood, and sprinkle it seven times before the LORD, in front of the veil [which screens off the Holy of Holies and the ark of the covenant]. He shall put some of the blood on the horns of the altar [of incense] which is before the LORD in the Tent of Meeting; and he shall pour out all the rest of the blood at the base of the altar of burnt offering which is at the doorway of the Tent of Meeting. He shall remove all its fat from the bull and offer it up in smoke on the altar.

And he shall offer all its fat up in smoke on the altar like the fat from the sacrifice of peace offerings; so the priest shall make atonement for him in regard to his sin, and he will be forgiven.

Then he shall remove all its fat, just as the fat was removed from the sacrifice of peace offerings; and the priest shall offer it up in smoke on the altar as a sweet and soothing aroma to the LORD. In this way the priest shall make atonement for him, and he will be forgiven.