Omission of Dan in Revelation 7

Question: Why is Dan omitted in Rev. 7?
Answer: Not because this tribe is not to have its share in the future partition and blessing; for Ezek. 48. enumerates it as the first and most northerly of all. A tradition among the fathers prevailed, founded on Gen. 49:17, that it was because antichrist was to spring from this tribe. It is certain that it was the first to sanction idolatry: an evil reprobated the more solemnly in the Revelation, because it will revive as the judgment of the quick draws near. It seems also omitted among the genealogies of the early chapters of 1 Chronicles.