Lev 5:17-19

17If any of you sin without knowing it, doing any of the things that by the Lord's commandments ought not to be done, you have incurred guilt, and are subject to punishment.18You shall bring to the priest a ram without blemish from the flock, or the equivalent, as a guilt offering; and the priest shall make atonement on your behalf for the error that you committed unintentionally, and you shall be forgiven.19It is a guilt offering; you have incurred guilt before the Lord.