Leviticus 19:20-22

20“If a man has sex with a slave girl whose freedom has never been purchased but who is committed to become another man’s wife, he must pay full compensation to her master. But since she is not a free woman, neither the man nor the woman will be put to death.

21The man, however, must bring a ram as a guilt offering and present it to the Lord at the entrance of the Tabernacle.

22The priest will then purify him before the Lord with the ram of the guilt offering, and the man’s sin will be forgiven.