“After 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.”
King James Version (KJV)
4:1 After these things - As if he had said, After I had written these letters from the mouth of the Lord. By the particle and, the several parts of this prophecy are usually connected: by the expression, after these things, they are distinguished from each other, #Rev 7:9|; 19:1. By that expression, and after these things, they are distinguished, and yet connected, #Rev 7:1|; 15:5; 18:1. St. John always saw and heard, and then immediately wrote down one part after another: and one part is constantly divided from another by some one of these expressions. I saw - Here begins the relation of the main vision, which is connected throughout; as it appears from the throne, and him that sitteth thereon; the Lamb; (who hitherto has appeared in the form of a man;) the four living creatures; and the four and twenty elders, represented from this place to the end. From this place, it is absolutely necessary to keep in mind the genuine order of the texts, as it stands in the preceding table. A door opened in heaven - Several of these openings are successively mentioned. Here a door is opened; afterward, the temple of God in heaven, #Rev 11:19|; 15:5; and, at last, heaven itself, 19:11. By each of these St. John gains a new and more extended prospect. And the first voice which I had heard - Namely, that of Christ: afterward, he heard the voices of many others. Said, Come up hither - Not in body, but in spirit; which was immediately done.
Re 4:1 The Open Door in Heaven SUMMARY OF REVELATION 4: The Voice from Heaven. The Throne and He Who Sat on the Throne. The Twenty-four Elders. The Four Living Forms. Their Cry Night and Day. The Doxology of the Twenty-four Elders. After this. "After these things" (Revised Version). After the letters to the churches had been dictated. The "things which must be after this" are yet to be shown. And, behold, I looked. Rather, "I saw in vision". And a door [was] opened in heaven. Heaven standing open so that the throne within could be seen. The first voice which I heard. The same voice that he had heard at first. See Re 1:10. Which said, Come up hither. Through the opened door. I will shew thee things which must be hereafter. Hence, we know that what John sees in the vision just opening belongs to events still future when he wrote.