From there they went against the inhabitants of Debir. (The name of Debir was formerly Kirjath Sepher.)
Judges 1:11
Surrounding context
1:10 Then Judah went against the Canaanites who dwelt in Hebron. (Now the name of Hebron was formerly Kirjath Arba.) And they killed Sheshai, Ahiman, and Talmai.
1:11 From there they went against the inhabitants of Debir. (The name of Debir was formerly Kirjath Sepher.)
1:12 Then Caleb said, "Whoever attacks Kirjath Sepher and takes it, to him I will give my daughter Achsah as wife."