Exodus 21:9

9 If he selects her for his son, he must grant her the rights of a daughter.

Read Exodus 21:9 Using Other Translations

And if he have betrothed her unto his son, he shall deal with her after the manner of daughters.
If he designates her for his son, he shall deal with her as with a daughter.
But if the slave’s owner arranges for her to marry his son, he may no longer treat her as a slave but as a daughter.

What does Exodus 21:9 mean?

John Gill's Exposition of the Bible
Exodus 21:9

And if he have betrothed her unto his son
Not caring to betroth and marry her himself, as being more suitable in age for his son than for himself;

he shall deal with her after the manner of daughters;
as if she was his daughter, and give her a dowry: or the son shall treat her after the manner the daughters of Israel are treated when married, by giving her food, raiment, and the duty of marriage, so Jarchi: or after the manner of the daughters of Israel that are virgins, and who are not sold, as Aben Ezra.

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