Leviticus 4:2

4:2 “Tell the Israelites, ‘When a person sins by straying unintentionally from any of the Lord’s commandments which must not be violated, and violates any one of them –

Leviticus 4:31

4:31 Then he must remove all of its fat (just as fat was removed from the peace offering sacrifice) and the priest must offer it up in smoke on the altar for a soothing aroma to the Lord. So the priest will make atonement on his behalf and he will be forgiven.