Ezekiel 48:30-34

The Lord next specified the gates of the holy city. Though Ezekiel did not name the city, Zechariah did. It is Jerusalem (Zechariah 14:8). On each of its 4,500 cubit-long (1.5 miles) sides there would be three gates. The ones facing north would be named in honor of the tribes of Reuben (Jacob’s firstborn), Judah (the kingly tribe), and Levi (the priestly tribe). All three of these patriarchs were Leah’s sons. The gates on the east would bear the names of Joseph and Benjamin (Rachel’s sons), and Dan (a son of Bilhah). The south gates would honor Simeon, Issachar, and Zebulun (Leah’s other three sons). The west gates would bear the names of Gad, Asher, and Naphtali (all sons of the two handmaids, Zilpah and Bilhah). The many gates demonstrate the accessibility of the city.

The New Jerusalem in the eternal state will also have three gates on each of its four sides each named for one of the 12 sons of Jacob (Revelation 21:12-13). That city will also be square, but it will be a cube or pyramid (Revelation 21:16). Also it will be very much larger (1,500 miles on each side, Revelation 21:16-17). Thus it seems that the eternal city will be similar to but not identical with the millennial city.