"Revelation part 3: The Church in Heaven"
Revelation 4:1 1After this I looked, and, behold, a door was opened in heaven: and the first voice which I heard was as it were of a trumpet talking with me; which said, Come up hither, and I will shew thee things which must be hereafter.
"After this", meaning, after the events of chapter 3 where we see the Church on earth, we now see the Church in Heaven. Revelation 4 and 5 begin the third part of Revelation, "the things which shall be hereafter" while the Church is still the subject before the events of the Tribulation take place.
