Four square city
Rev 21:15 And he that talked with me had a golden reed to measure the city, and the gates thereof, and the wall thereof.
Rev 21:16 And the city lieth foursquare, and the length is as large as the breadth: and he measured the city with the reed, twelve thousand furlongs. The length and the breadth and the height of it are equal.
The city is four square, such as a cube. We have seen churches named, Foursquare. This is referring to God's dwelling place with the saints. A place where God's presence dwells. The Holy City, the New Jerusalem, the tabernacle of God with the saints.
He measured the city with the reed: The size of the New Jerusalem is enormous; twelve thousand furlongs equals 1,500 miles. This is the same distance from Maine to Florida; the square footage would approximate the size of the Moon. (Guzik)
Rev 21:17 And he measured the wall thereof, an hundred and forty and four cubits, according to the measure of a man, that is, of the angel.
The cubit is the measure of the elbow to the tip of the middle finger. The measure of a man was about 18 inches, and the angel was as a man in stature. This being an average stature of man. A man six foot three inches measures 21 inches. Some Egyptian cubits were 21 inches. Twelve times twelve; twelve apostles times the 12 tribes equals one hundred forty-four cubits, or 72 yards. The wall is far beneath the height of the city. There will be plenty of room for all the saints.