What new testament book tells us of the work of the early church
the book of acts
The Battle of Armageddon can be found in the New Testament book of Revelation (see Revelation 16).
the book of John
According to the Bible most of the New Testament books have Prophecies for the End Times, But the book of Revelation is the one that seems to deal the most with end time events prophesied by Jesus and given to John the apostle.
The New Testament epistle to Philemon.
It can be found in "Revelation" That book can be found in the last book of the bible
Some believe that the Book of Revelation provides prophecies about the future. If it does, none of these prophecies seems to have come to pass as yet.