On the east were three gates, and on the north three gates, and on the south three gates, and on the west three gates.

Revelation 21:11b-

 4. What indicates that New Jerusalem is not the fleshly nation of Israel?

⁴ On its 12 gates, there are inscribed the names of the 12 tribes of Israel. Therefore, this symbolic city is made up of the 144,000, who were sealed “out of every tribe of the sons of Israel.” (Revelation 7:4-8)