Revelation 4:1

After these things I saw, and behold, a door was opened in heaven; and the first voice which I heard, like the voice of a trumpet speaking with me, said: Come up hither, and I will show you things that must be hereafter.

Revelation 1:10

I was in spirit on the Lord's day, and I heard behind me a great voice like that of a trumpet,

Revelation 1:19

Write, therefore, the things which you have seen, and the things which are, and those which shall be here after;

Revelation 11:12

And they heard a great voice from heaven, saying to them: Come up hither. And they went up into heaven in a cloud, and their enemies beheld them.

Revelation 22:6

And he said to me: These words are faithful and true; and the Lord God of the spirits of the prophets has sent his angel to show his servants the things that must shortly take place.

Matthew 3:16

And after Jesus was immersed, he came up immediately from the water; and lo, the heavens were opened to him, and he saw the Spirit of God descending like a dove, and coming upon him.

Mark 1:10

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

Luke 3:21

And it came to pass, while all the people were being immersed, that Jesus also was immersed; 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 some vessel, like a great sheet, descending, bound by the four corners, and let down to the earth.

Revelation 16:17

And the seventh angel poured out his cup into the air; and there came a great voice from the temple of heaven, from the throne, saying: It is done.

John 16:13

But when he, the Spirit of the truth, has come, he will guide you into all the truth; for he will not speak of himself; but what he hears, that will he speak, and he will show you things to come.

Revelation 1:1-3

THE Revelation of Jesus Christ, which God gave to him, that he might show to his servants the things that must shortly come to pass; and he sent it by his angel, and made it known 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 after Jesus was immersed, he came up immediately from the water; and lo, the heavens were opened to him, and he saw the Spirit of God descending like a dove, and coming upon him.
Mark 1:10
And immediately on coming up from the water, he saw the heavens opened, and the Spirit like a dove descending upon him.
Luke 3:21
And it came to pass, while all the people were being immersed, that Jesus also was immersed; 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 some vessel, like a great sheet, descending, bound by the four corners, and let down to the earth.

The first

Revelation 1:10
I was in spirit on the Lord's day, and I heard behind me a great voice like that of a trumpet,
Revelation 16:17
And the seventh angel poured out his cup into the air; and there came a great voice from the temple of heaven, from the throne, saying: It is done.

And i

Revelation 1:19
Write, therefore, the things which you have seen, and the things which are, and those which shall be here after;
Revelation 22:6
And he said to me: These words are faithful and true; and the Lord God of the spirits of the prophets has sent his angel to show his servants the things that must shortly take place.
John 16:13
But when he, the Spirit of the truth, has come, he will guide you into all the truth; for he will not speak of himself; but what he hears, that will he speak, and he will show you things to come.