Verse 1
Section 2: The Heavenly Apocalypse (chapters 4-11)
4:1–11 Verses 1–11 introduce the throne-room vision of chs. 4 and 5. These chapters form one scene in which John is invited to behold future events which must shortly take place, for the time was at hand (Revelation 1:1).
He depends heavily on Moses, Ezekiel, and Daniel to describe the wonders he witnessed. The vision in these chapters includes the introduction of the Lamb and leads to the seal judgments in ch. 6.
It builds on the visions of Isaiah 6:1-4, Ezekiel 1:4-28, and Daniel 7:9-10, where God is seen enthroned in power and majesty. God’s throne dominates Revelation, and the worship in the rest of the book flows from this scene.
Chapter 4 - The Old Testament Throne Scene
John’s Visionary Posture, Revelation 4:1-2 a
The Throne, Revelation 4:2-7
Heavenly Praise, Revelation 4:8-11
Chapter 5 - The New Testament Throne Scene
The Search for One Worthy to Open the Book, Revelation 5:1-5
The Lamb At the Right Hand of God, Revelation 5:6-7
The Subjection of Heaven and Earth To the Lamb, Revelation 5:8-14
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Revelation 4:1 The Eternal Throne. God as Creator, Revelation 4:11. The throne is in Heaven.
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After these things . . Refers to the reception of the letters to the seven churches. The phrase used here indicates that John received this vision after the previous one.
I looked . . Better, I beheld, and lo! as Revelation 5:6, Revelation 5:11 &c.; Daniel 7:6, Daniel 7:11 &c. The purport of the word is rather that he continued looking at what he had seen before, than that he looked in another direction. There is a transition: henceforth he goes to another point of view, and sees no more the Son of Man in the midst of the seven candlesticks. - CBSC
opened--"standing open"; not as though John saw it in the act of being opened. Similar to other biblical visions (Ezekiel 1:1; Matthew 3:16; John 1:51; Acts 10:11) ; Cf. Revelation 19:11 (“heaven standing open”).
This is another way of expressing God’s revelation of Himself to mankind.
and the first voice which I had heard, like the sound of a trumpet . . At first this implied Jesus speaking, but because chapters 4 & 5 are a literary unit and Jesus is not introduced until Revelation 5:5, Revelation 5:9-10, 12, 13, this may refers to a revealing angel.
An angel and a trumpet blast are related in Paul’s description of the Second Coming (cf. 1 Thessalonians 4:16).
Come up hither--through the "open door." A summons to behold the visions (compare Ezekiel 3:12; Ezekiel 11:1).
things which must take place after this . . According to Revelation 1:1, Revelation 1:3; Revelation 22:6, Revelation 22:10, things which must shortly come to pass, for the time was at hand.