Joshua 15:15
And he went up thence to the inhabitants of Debir: and the name of Debir before was Kirjath–sepher.
Cross-reference
Joshua 15:49
Parallel
Joshua 15:49 lists Debir (Kiriath-sannah) as a Judahite city — confirming the same location.
Joshua 10:38
Parallel
Joshua 10:38 describes Joshua's conquest of the city Debir, the same city Caleb later attacked.
Judges 1:11–13
Parallel
Judges 1:11-13 gives the same account of Caleb's offer to capture Debir — a parallel narrative.