There are twelve entrances to the city of Jerusalem. Each of the four walls measures 2,520 yards and has three gates in it, each named for one of the tribes. The gates in the north wall are named for Reuben, Judah, and Levi; those in the east wall, for Joseph, Benjamin, and Dan; those in the south wall, for Simeon, Issachar, and Zebulun; and those in the west wall are named for Gad, Asher, and Naphtali. 1
References for Ezekiel 48:30
48.30-34 Rev 21.12, 13.