28 And the priest shall make an atonement for the soul that sins ignorantly, when he sins by ignorance before the LORD, to make an atonement for him; and it shall be forgiven him.
Numbers 15:28 Cross References - KJ2000
Leviticus 4:35
35 And he shall take away all its fat, 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 has committed, and it shall be forgiven him.