Joshua 15:15-17 NIV

15 From there he marched against the people living in Debir (formerly called Kiriath Sepher).
16 And Caleb said, “I will give my daughter Aksah in marriage to the man who attacks and captures Kiriath Sepher.”

References for Joshua 15:16

17 Othniel son of Kenaz, Caleb’s brother, took it; so Caleb gave his daughter Aksah to him in marriage.

References for Joshua 15:17