Exodus 21:10
If he takes another wife to himself, he shall not diminish her food, her clothing, and her marital rights.
World English Bible (Public Domain)
In context
Before · Exodus 21:8–9
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.
10If he takes another wife to himself, he shall not diminish her food, her clothing, and her marital rights.