Exodus 21:9
If he marries her to his son, he shall deal with her as a daughter.
World English Bible (Public Domain)
In context
Before · Exodus 21:7–8
7“If a man sells his daughter to be a female servant, she shall not go out as the male servants do. 8If 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.
9If he marries her to his son, he shall deal with her as a daughter.