Why was Dan removed from the list of 12 Israel tribes in Rev 7? Here is the list of 12 tribes of Israel from Genesis, Numbers and Revelation.


I sorted them according to the list in  Genesis 29-30.
In Numbers, Levi is replaced by Ephraim and Manasseh who replaced Joseph also.
But in Revelation 7 Dan is removed and replaced by Manasseh.

Why are these list different? Why is Dan removed from the list?
Dan fell into idolatry in Judges 17 and 18, and was thus removed:

Judges 18:30-31:


  And the people of Dan set up the carved image for themselves, and
  Jonathan the son of Gershom, son of Moses, and his sons were priests
  to the tribe of the Danites until the day of the captivity of the
  land. So they set up Micah's carved image that he made, as long as the
  house of God was at Shiloh.


Also, Ephraim is missing as well.  Hosea 4:17 explains why:


  Ephraim is joined to idols; leave him alone.


See this link for more details.