Jos 10:38-39
Joshua then turned southwards with all Israel (i.e., all the army), attacked Debir and took it, and the towns dependent upon it, in the same manner as those mentioned before. Debir, formerly called Kirjath-sepher, i.e., book town, πόλις γραμμάτων (lxx Jos 15:15; Jdg 1:11), and Kirjath-sanna, i.e., in all probability the city of palm branches (Jos 15:49), was given up by Judah to the priests (Jos 21:15). It stood upon the mountains of Judah (Jos 15:49), to the south of Hebron, but has not yet been certainly discovered, though V. de Velde is probably correct in his supposition that it is to be seen in the ruins of Dilbeh, on the peak of a hill to the north of Wady Dilbeh, and on the road from Dhoberiyeh to Hebron, about two hours to the south-west of the latter. For, according to Dr. Stewart, there is a spring at Dilbeh, the water of which is conducted by an aqueduct into the Birket el Dilbeh, at the foot of the said hill, which would answer very well to the upper and lower springs at Debir, if only Debir might be placed, according to Jos 15:49, so far towards the north.
Moreover, not very long afterwards, probably during the time when the Israelites were occupied with the subjugation of northern Canaan, Hebron and Debir were taken again by the Canaanites, particularly the Anakites, as Joshua had not entirely destroyed them, although he had thoroughly cleared the mountains of Judah of them, but had left them still in the towns of the Philistines (Jos 11:21-22). Consequently, when the land was divided, there were Anakites living in both Hebron and Debir; so that Caleb, to whom these towns were given as his inheritance, had first of all to conquer them again, and to exterminate the Anakites (Jos 14:12; Jos 15:13-17 : cf. Jdg 1:10-13).