Exodus 21:9 in the King James Version
And if he have betrothed her unto his son, he shall deal with her after the manner of daughters.
Context
8 If she doesn’t please her master, who has married her to himself, then he shall let her be redeemed. He shall have no right to sell her to a foreign people, since he has dealt deceitfully with her.
9 If he marries her to his son, he shall deal with her as a daughter.
10 If he takes another wife to himself, he shall not diminish her food, her clothing, and her marital rights.