Jerusalem is built as a city that is compact together. (Psalm 122:3)
Jerusalem is Zion, “the city of our God … the city of the Great King” (Psalm 48:1-2). It is where the “tribes of the Lord” go up to worship the Lord and give thanks (Psalm 122:4). It is the place of the “house of the Lord” (Psalm 122:1).
The revelation of the New Testament is that there is a New Jerusalem, a heavenly city which will one day come down and join heaven and earth together as one — the will of God being done on earth as it is in heaven. And all who believe on King Jesus the Messiah are now citizens of that city (see Praying With Zion).
The psalm writer says that “Jerusalem is built as a city that is compact together.” One translation puts it this way: “Jerusalem is built as a city whose fellowship is complete” (this is Brenton’s English translation of the Septuagint, which is an ancient Greek translation of the Old Testament).
For the psalm writer, Jerusalem was more than a geographical location, it represented a relationship — the people of the Lord entering together into His presence. It is a fellowship that is complete, compacted together.
Paul writes about the Church in a similar way. In 1 Corinthians 1:10, he admonishes the Jesus believers at Corinth to be “perfectly joined together in the same mind and in the same judgment.” He wanted their attitude and behavior to reflect what was actually already true about them. And in his Ephesians letter, he describes that truth about our relationship as the body of Christ, with Christ as the head,
from whom the whole body, joined and knit together by what every joint supplies, according to the effective working by which every part does its share, causes growth of the body for the edifying of itself in love. (Ephesians 4:16)Joined and knit together. A city that is compact together, whose fellowship is complete. That is the truth about the heavenly Jerusalem and the reality of our identity in Christ. Let us, then, be perfectly joined together in the same mind and in the same judgment. In this way we will manifest who we are in Christ, and the unity that we truly have in Him.