Jerusalem is one that is built like a city that has been joined together in oneness,

Psalm 122:1-4

Especially was unity evident at national festivals, when the 12 tribes of Israel joined in united worship of Jehovah at the sacred tabernacle in Jerusalem. And during the reign of their shepherd-king David, the tribes remained united not just due to fleshly ties but primarily because of the organized worship of their God. Yes, Jerusalem was the divinely approved center of united, organized worship under the one priesthood taken from the tribe of Levi and the family of Israel’s first high priest, Aaron, the older brother of the prophet Moses.