1 After all this I looked and saw a door in Heaven standing open, and the voice that I had previously heard, which resembled the blast of a trumpet, again spoke to me and said, "Come up here, and I will show you things which are to happen in the future."
Revelation 4:1 Cross References - WNT
Matthew 3:16
16 and Jesus was baptized, and immediately went up from the water. At that moment the heavens opened, and he saw the Spirit of God descending like a dove and alighting upon Him,
Mark 1:10
10 and immediately on His coming up out of the water He saw an opening in the sky, and the Spirit like a dove coming down to Him;
Luke 3:21
21 Now when all the people had been baptized, and Jesus also had been baptized and was praying, the sky opened,
John 16:13
13 But when He has come--the Spirit of Truth--He will guide you into all the truth. For He will not speak as Himself originating what He says, but all that He hears He will speak, and He will make known the future to you.
Acts 7:56
56 "I can see Heaven wide open," he said, "and the Son of Man standing at God's right hand."
Acts 10:11
11 The sky had opened to his view, and what seemed to be an enormous sail was descending, being let down to the earth by ropes at the four corners.
Revelation 1:1-3
1 The revelation given by Jesus Christ, which God granted Him, that He might make known to His servants certain events which must shortly come to pass: and He sent His angel and communicated it to His servant John.
2 This is the John who taught the truth concerning the Word of God and the truth told us by Jesus Christ-- a faithful account of what he had seen.
3 Blessed is he who reads and blessed are those who listen to the words of this prophecy and lay to heart what is written in it; for the time for its fulfillment is now close at hand.
Revelation 1:10
10 In the Spirit I found myself present on the day of the Lord, and I heard behind me a loud voice which resembled the blast of a trumpet.
Revelation 1:19
19 Write down therefore the things you have just seen, and those which are now taking place, and those which are soon to follow:
Revelation 11:12
12 Then they heard a loud voice calling to them out of Heaven, and bidding them come up; and they went up to Heaven in the cloud, and their enemies saw them go.
Revelation 16:17
17 Then the seventh angel poured his bowl into the air; and a loud voice came out of the sanctuary from the throne, saying, "Everything is now ready."
Revelation 22:6
6 And he said to me, "These words are trustworthy and true; and the Lord, the God of the spirits of the Prophets, sent His angel to make known to His servants the things which must soon happen.