Revelation 4:1

Afterward I had another vision: There was a door standing open in the heavens and the first voice like a trumpet that I had heard speak to me, said, "Come up here, and I will show you what must take place."

Revelation 1:10

On the Lord's day I fell into a trance, and I heard a loud voice like a trumpet behind me

Revelation 1:19

So write what you have seen, what is now and what is to happen hereafter.

Revelation 11:12

And they heard a loud voice from heaven say to them, "Come up here." And they went up to heaven in a cloud, before the eyes of their enemies.

Revelation 22:6

"These words are trustworthy and true," he said to me; "For the Lord, the God of the spirits of the prophets, sent his angel to show his slaves what must happen very soon.

Matthew 3:16

And when Jesus was baptized, he went right up out of the water, and the heavens opened, and he saw the Spirit of God come down like a dove and light upon him,

Mark 1:10

And just as he was coming up out of the water he saw the heavens torn open and the Spirit coming down like a dove to enter into him,

Luke 3:21

Now when all the people were baptized and when Jesus also after his baptism was praying, heaven opened

Acts 7:56

And he said, "Look! I can see heaven open, and the Son of Man standing at God's right hand!"

Acts 10:11

and saw the sky opened and a thing like a great sheet coming down, lowered to the ground by the four corners,

Revelation 16:17

The seventh emptied his bowl upon the air, and a loud voice came out of the temple from the throne, saying, "It is all over!"

John 16:13

but when the Spirit of Truth comes, he will guide you into the full truth, for he will not speak for himself but will tell what he hears, and will announce to you the things that are to come.

Revelation 1:1-3

A revelation made by Jesus Christ which God gave him to disclose to his slaves of what must very soon happen. He sent and communicated it by his angel to his slave 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 right up out of the water, and the heavens opened, and he saw the Spirit of God come down like a dove and light upon him,
Mark 1:10
And just as he was coming up out of the water he saw the heavens torn open and the Spirit coming down like a dove to enter into him,
Luke 3:21
Now when all the people were baptized and when Jesus also after his baptism was praying, heaven opened
Acts 7:56
And he said, "Look! I can see heaven open, and the Son of Man standing at God's right hand!"
Acts 10:11
and saw the sky opened and a thing like a great sheet coming down, lowered to the ground by the four corners,

The first

Revelation 1:10
On the Lord's day I fell into a trance, and I heard a loud voice like a trumpet behind me
Revelation 16:17
The seventh emptied his bowl upon the air, and a loud voice came out of the temple from the throne, saying, "It is all over!"

And i

Revelation 1:19
So write what you have seen, what is now and what is to happen hereafter.
Revelation 22:6
"These words are trustworthy and true," he said to me; "For the Lord, the God of the spirits of the prophets, sent his angel to show his slaves what must happen very soon.
John 16:13
but when the Spirit of Truth comes, he will guide you into the full truth, for he will not speak for himself but will tell what he hears, and will announce to you the things that are to come.