What did Caleb say he'd give to whoever could smite Kirjathsepher?

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His daughter Achsah for a wife

And Caleb said, He that smiteth Kirjathsepher, and taketh it, to him will I give Achsah my daughter to wife. Joshua 15:16

(Caleb's nephew, Othniel, smote Kirjathsepher and got Caleb's daughter for a wife.)

And Othniel the son of Kenaz, the brother of Caleb, took it: and he gave him Achsah his daughter to wife. Joshua 15:17

The same story is told in the book of Judges.

And Caleb said, He that smiteth Kirjathsepher, and taketh it, to him will I give Achsah my daughter to wife.

And Othniel the son of Kenaz, Caleb's younger brother, took it: and he gave him Achsah his daughter to wife. Judges 1:12-13