Judges 1:21

The children of Benjamin did not drive out the Jebusites. — In Joshua 15:63 we find the same statement respecting the children of Judah. (See Judges 1:8.) Jerusalem was on the borders of Judah (Joshua 16:8) and Benjamin (Judges 18:28). It belongs more properly to the latter, but the conquest of Zion by David (2 Samuel 5:7) naturally caused its closer identification with Judah. The Jebusites were tolerated inhabitants ever after this conquest, and had their own prince — Araunah (2 Samuel 24:18) — “Araunah the king.” We even find traces of them after the exile (Ezra 9:1). Jerusalem is a remarkable exception to the rule that the Israelites conquered “the hill-country,” but not the plain.

Unto this day. — The assignment of Jerusalem to Benjamin shows that this narrative, though not contemporaneous, is older than the conquest of Jerusalem by David.