Leviticus 19:20-22

20“ ‘If a man sleeps with a female slave who is promised to another man but who has not been ransomed or given her freedom, there must be due punishment. Yet they are not to be put to death, because she had not been freed.

21The man, however, must bring a ram to the entrance to the tent of meeting for a guilt offering to the Lord.

22With the ram of the guilt offering the priest is to make atonement for him before the Lord for the sin he has committed, and his sin will be forgiven.