Psalm 122:3

You are a building which has been reared on the foundation of the Apostles and Prophets, the cornerstone being Christ Jesus Himself,

There is but one body and but one Spirit, as also when you were called you had one and the same hope held out to you.

So in the Spirit he carried me to the top of a vast, lofty mountain, and showed me the holy city, Jerusalem, coming down out of Heaven from God,

Treasury of Scripture Knowledge

Jerusalem is builded as a city that is compact together:

You are a building which has been reared on the foundation of the Apostles and Prophets, the cornerstone being Christ Jesus Himself,

There is but one body and but one Spirit, as also when you were called you had one and the same hope held out to you.

So in the Spirit he carried me to the top of a vast, lofty mountain, and showed me the holy city, Jerusalem, coming down out of Heaven from God,