Joshua 15:60

As for the Jebusites, the inhabitants of Jerusalem,.... From whom the city was called Jebus, Jdg 19:10. The Jews say, that these Jebusites were not those of the seven nations; but there was a man whose name was Jebus, and he was of the Philistines, of the seed of Abimelech, and the place was called by his name Jebus; and the men of that family that dwelt at Jerusalem, their names were called Jebusites, having their descent from him; so Araunah, the Jebusite, was king of that place: and the fort of that place was Zion, which was at Jerusalem: so Kimchi relates from their Rabbins, and with whom Jarchi agrees, but without any foundation; there is no doubt to be made of it, that these Jebusites were Canaanites:

the children of Judah could not drive them out; according to the above Jewish writers they could have done it, but it was not fit and proper they should, because of the oath of Abraham to Abimelech, from whom they suppose these Jebusites sprung; but the case was this; though Joshua slew the king of this place, and took his land with the rest, Jos 10:1; and though the men of Judah retook it after his death, it having been got into the hands of the Jebusites again, Jdg 1:8; yet either the fort of Zion was never taken by either of them, or if taken, the Jebusites got possession of it again, and held it until the times of David; see Sa2 5:6,