Cross reference
Revelation 21:13
13 And on the east were three doors; and on the north three doors; and on the south three doors; and on the west three doors.
Ezekiel 48:31-34
31 And the doors of the town are to be named by the names of the tribes of Israel; three doors on the north, one for Reuben, one for Judah, one for Levi;
32 And at the east side, four thousand five hundred by measure, and three doors, one for Joseph, one for Benjamin, one for Dan;
33 And at the south side, four thousand five hundred by measure, and three doors, one for Simeon, one for Issachar, one for Zebulun;
34 At the west side, four thousand five hundred by measure, with their three doors, one for Gad, one for Asher, one for Naphtali.