Joshua 10:39
And he took it, and the king thereof, and all the cities thereof; and they smote them with the edge of the sword, and utterly destroyed all the souls that were therein; he left none remaining: as he had done to Hebron, so he did to Debir, and to the king thereof; as he had done also to Libnah, and to her king.
Cross-reference
Joshua 10:37 provides the account of Hebron's destruction that verse 39 explicitly compares to Debir's fate.
Joshua 10:40 continues the same conquest narrative, extending the pattern of total destruction to the whole region.
Joshua 10:28 describes the conquest of Makkedah, using the same pattern of utter destruction.
Joshua 10:33 records the total destruction of Gezer, another instance of the same pattern applied to Debir in verse 39.
Joshua 11:8 describes a similar total defeat of the northern coalition, mirroring the pattern in the south.
Joshua 6:21 records the total destruction of Jericho, the same method applied to Debir here.
Joshua 11:12 summarizes the taking of all northern cities and kings, similar to the southern campaign here.
Joshua 15:7 mentions Debir in Judah's border allotment, the same city conquered here.
Deuteronomy 3:3 reports the same kind of total destruction of Og, king of Bashan, as seen here.
In Judges 1:11, the same city Debir is conquered again by Judah's tribe, offering a parallel account of its capture.