I'm wondering why the tribes of Dan and Ephraim are not mentioned in this list:
Revelation 7
3 saying, “Do not harm the earth, the sea, or the trees till we have sealed the servants of our God on their foreheads.” 4 And I heard the number of those who were sealed. One hundred and forty-four thousand of all the tribes of the children of Israel were sealed:
5 of the tribe of Judah twelve thousand were sealed;
of the tribe of Reuben twelve thousand were sealed;
of the tribe of Gad twelve thousand were sealed;
6 of the tribe of Asher twelve thousand were sealed;
of the tribe of Naphtali twelve thousand were sealed;
of the tribe of Manasseh twelve thousand were sealed;
7 of the tribe of Simeon twelve thousand were sealed;
of the tribe of Levi twelve thousand were sealed;
of the tribe of Issachar twelve thousand were sealed;
8 of the tribe of Zebulun twelve thousand were sealed;
of the tribe of Joseph twelve thousand were sealed;
of the tribe of Benjamin twelve thousand were sealed.
This might be a clue?
(From Wikipedia)According to the Hebrew Bible, Jacob (who was also called Israel) had 12 sons and at least one daughter (Dinah) by two wives and two concubines. The twelve sons fathered the twelve Tribes of Israel.
When the land of Israel was apportioned among the tribes in the days of Joshua, the Tribe of Levi, being priests, did not receive land (Joshua 13:33, (14:3). However; the tribe of Levi was given cities. Six cities were given to the tribe as refuge cities for all men of Israel and they were to be controlled by the Levites. Three of these cities were located on each side of the Jordan River. In addition, 42 other cities (and their respective open spaces) totaling 48 cities were given to the Tribe of Levi. (Numbers 35)
On the other hand, Jacob elevated the descendants of Ephraim and Manasseh (the two sons of Joseph by his Egyptian wife Asenath) (Genesis 41:50) to the status of full tribes in their own right, replacing the Tribe of Joseph (Joshua 14:4). Each received its own land and had its own encampment during the 40 years of wandering in the desert.
Thus, the two divisions of the tribes are:
Traditional division:
Reuben
Simeon
Levi
Judah
Issachar
Zebulun
Dan
Naphtali
Gad
Asher
Joseph
Benjamin
Division according to apportionment of land in Israel:
Reuben
Simeon
Judah
Issachar
Zebulun
Dan
Naphtali
Gad
Asher
Benjamin
Ephraim (son of Joseph)
Manasseh (son of Joseph)
Levi (no territorial allotment, except a number of cities located within the territories of the other tribes)