Jamieson, Fausset and Brown on Revelation 21:13

13. On the north ... on the south--A, B, Vulgate, Syriac, and Coptic read, "And on the north and on the south." In Ezekiel, Joseph, Benjamin, Dan (for which Manasseh is substituted in Re 7:6), are on the east (Eze 48:32); Reuben, Judah, Levi, are on the north (Eze 48:31); Simeon, Issachar, Zebulun, on the south (Eze 48:33); Gad, Asher, Naphtali, on the west (Eze 48:34). In Numbers, Judah, Issachar, Zebulun are on the east (Nu 2:3, 5, 7). Reuben, Simeon, Gad, on the south (Nu 2:10, 12, 14). Ephraim, Manasseh, Benjamin, on the west (Nu 2:18, 20, 22). Dan, Asher, Naphtali, on the north (Nu 2:25, 27, 29).