Cross reference
Judges 1:11
11 From there he went against the inhabitants of Debir. (Now the name of Debir before was Kiriath Sepher.)
Joshua 15:15
15 He went up there against the inhabitants of Debir: now the name of Debir before was Kiriath Sepher.
Joshua 10:38-39
38 Joshua returned, and all Israel with him, to Debir, and fought against it:
39 and he took it, and the king of it, and all the cities of it; and they struck them with the edge of the sword, and utterly destroyed all the souls who were therein; he left none remaining: as he had done to Hebron, so he did to Debir, and to the king of it; as he had done also to Libnah, and to the king of it.