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 Acsah1 in marriage to the man who attacks and captures Kiriath Sepher."

References for Joshua 15:16

17 Othniel2 son of Kenaz, Caleb's brother, took it; so Caleb gave his daughter Acsah to him in marriage.

References for Joshua 15:17