Hello. The Bible literally says Jerusalem was not a Jewish town.
Joshua 10:1-3 When King Adoni-zedek of Jerusalem heard how Joshua had taken Ai and had utterly destroyed it, doing to Ai and its king as he had done to Jericho and its king, and how the inhabitants of Gibeon had made peace with Israel and were among them, 2 he[a] became greatly frightened, because Gibeon was a large city, like one of the royal cities, and was larger than Ai, and all its men were warriors. 3 So King Adoni-zedek of Jerusalem sent a message to King Hoham of Hebron, to King Piram of Jarmuth, to King Japhia of Lachish, and to King Debir of Eglon..
Joshua 10:5 Then the five kings of the Amorites—the king of Jerusalem, the king of Hebron, the king of Jarmuth, the king of Lachish, and the king of Eglon—gathered their forces and went up with all their armies and camped against Gibeon and made war against it.
