Leviticus 5:15-17 New Revised Standard Version (NRSV)
15 When any of you commit a trespass and sin unintentionally in any of the holy things of the Lord, you shall bring, as your guilt offering to the Lord, a ram without blemish from the flock, convertible into silver by the sanctuary shekel; it is a guilt offering. 16 And you shall make restitution for the holy thing in which you were remiss, and shall add one-fifth to it and give it to the priest. The priest shall make atonement on your behalf with the ram of the guilt offering, and you shall be forgiven.
17 If 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.