Revelation 4:1

After this I looked, and behold, a door standing open in heaven. And the voice, which I had first heard speaking to me like a trumpet said, "Come up here, and I will show you what must take place after this."

Revelation 1:10

I was in the Spirit on the Lord's Day, and I heard behind me a loud voice like a trumpet,

Revelation 1:19

Write, therefore, what you have seen, what is now and what will take place after this.

Revelation 11:12

Then they heard a loud voice from heaven saying to them, "Come up here." And they went up to heaven in a cloud, while their enemies looked on.

Revelation 22:6

And he said to me, "These words are trustworthy and true. And the Lord, the God of the spirits of the prophets, has sent his angel to show his servants the things which must soon take place."

Matthew 3:16

And when Jesus was baptized, he went up immediately from the water, and behold, the heavens were opened and he saw the Spirit of God descending like a dove, and alighting on him.

Mark 1:10

And immediately coming up out of the water, he saw the heavens opened and the Spirit descending upon him like a dove.

Luke 3:21

When all the people were being baptized, Jesus was also baptized. And as he was praying, the heaven was opened

Acts 7:56

and he said, "Behold, I see the heavens opened, and the Son of Man standing at the right hand of God."

Acts 10:11

and he saw heaven opened, and something descending, like a great sheet, let down by four corners to the earth.

Revelation 16:17

The seventh angel poured out his bowl into the air, and out of the temple came a loud voice from the throne, saying, "It is done!"

John 16:13

But when he, the Spirit of truth, comes, he will guide you into all truth; for he will not speak on his own authority, but whatever he hears he will speak; and he will tell you things to come.

Revelation 1:1-3

The revelation of Jesus Christ, which God gave him to show to his servants what must soon take place. And he made it known by sending his angel to his servant John,

Treasury of Scripture Knowledge

Summary

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.

Bible References

A door

Matthew 3:16
And when Jesus was baptized, he went up immediately from the water, and behold, the heavens were opened and he saw the Spirit of God descending like a dove, and alighting on him.
Mark 1:10
And immediately coming up out of the water, he saw the heavens opened and the Spirit descending upon him like a dove.
Luke 3:21
When all the people were being baptized, Jesus was also baptized. And as he was praying, the heaven was opened
Acts 7:56
and he said, "Behold, I see the heavens opened, and the Son of Man standing at the right hand of God."
Acts 10:11
and he saw heaven opened, and something descending, like a great sheet, let down by four corners to the earth.

The first

Revelation 1:10
I was in the Spirit on the Lord's Day, and I heard behind me a loud voice like a trumpet,
Revelation 16:17
The seventh angel poured out his bowl into the air, and out of the temple came a loud voice from the throne, saying, "It is done!"

And i

Revelation 1:19
Write, therefore, what you have seen, what is now and what will take place after this.
Revelation 22:6
And he said to me, "These words are trustworthy and true. And the Lord, the God of the spirits of the prophets, has sent his angel to show his servants the things which must soon take place."
John 16:13
But when he, the Spirit of truth, comes, he will guide you into all truth; for he will not speak on his own authority, but whatever he hears he will speak; and he will tell you things to come.