Revelation 4:1

After this I looked, and behold, a door standing open in heaven! And the first voice which I had heard, like the sound of a [war] trumpet speaking with me, said, “Come up here, and I will show you what must take place after these things.”

Revelation 1:10

I was in the Spirit [in special communication with the Holy Spirit and empowered to receive and record the revelation from Jesus Christ] on the Lord’s Day, and I heard behind me a loud voice like the sound of a trumpet,

Revelation 1:19

So write the things which you have seen [in the vision], and the things which are [now happening], and the things which will take place after these things.

Revelation 11:12

And the two witnesses heard a loud voice from heaven saying to them, “Come up here.” Then they ascended into heaven in the cloud, and their enemies watched them.

Revelation 22:6

Then he said to me, “These words are faithful and true.” And the Lord, the God of the spirits of the prophets, has sent His angel [as a representative] to show His bond-servants the things that must soon take place.

Matthew 3:16

After Jesus was baptized, He came up immediately out of the water; and behold, the heavens were opened, and he (John) saw the Spirit of God descending as a dove and lighting on Him (Jesus),

Mark 1:10

Immediately coming up out of the water, he (John) saw the heavens torn open, and the Spirit like a dove descending on Him (Jesus);

Luke 3:21

Now when all the people were baptized, Jesus was also baptized, and while He was praying, the [visible] heaven was opened,

Acts 7:56

and he said, “Look! I see the heavens opened up [in welcome] and the Son of Man standing at the right hand of God!”

Acts 10:11

and he saw the sky opened up, and an object like a great sheet descending, lowered by its four corners to the earth,

Revelation 16:17

Then the seventh angel poured out his bowl into the air, and a loud voice came out of the temple from the throne [of God], saying, “It is done. [It is all over, it is all accomplished, it has come.]”

Exodus 1:1

Now these are the names of the sons of Israel who came to Egypt with Jacob; each came with his household:

Exodus 19:24

Then the Lord said to him, “Go down and come up again, you and Aaron with you; but do not let the priests and the people break through [the barriers] to come up to the Lord, or He will break forth [in judgment] against them [and destroy them].”

Exodus 24:12

Now the Lord said to Moses, “Come up to Me on the mountain and stay there, and I will give you the stone tablets with the law and the commandments which I have written for their instruction.”

Exodus 34:2-3

So be ready by morning, and come up in the morning to Mount Sinai, and present yourself there to Me on the top of the mountain.

John 16:13

But when He, the Spirit of Truth, comes, He will guide you into all the truth [full and complete truth]. For He will not speak on His own initiative, but He will speak whatever He hears [from the Father—the message regarding the Son], and He will disclose to you what is to come [in the future].

Revelation 1:1-3

This is the revelation of Jesus Christ [His unveiling of the divine mysteries], which God [the Father] gave to Him to show to His bond-servants (believers) the things which must soon take place [in their entirety]; and He sent and communicated it by His angel (divine messenger) to His bond-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

Exodus 1:1
Now these are the names of the sons of Israel who came to Egypt with Jacob; each came with his household:
Matthew 3:16
After Jesus was baptized, He came up immediately out of the water; and behold, the heavens were opened, and he (John) saw the Spirit of God descending as a dove and lighting on Him (Jesus),
Mark 1:10
Immediately coming up out of the water, he (John) saw the heavens torn open, and the Spirit like a dove descending on Him (Jesus);
Luke 3:21
Now when all the people were baptized, Jesus was also baptized, and while He was praying, the [visible] heaven was opened,
Acts 7:56
and he said, “Look! I see the heavens opened up [in welcome] and the Son of Man standing at the right hand of God!”
Acts 10:11
and he saw the sky opened up, and an object like a great sheet descending, lowered by its four corners to the earth,

The first

Revelation 1:10
I was in the Spirit [in special communication with the Holy Spirit and empowered to receive and record the revelation from Jesus Christ] on the Lord’s Day, and I heard behind me a loud voice like the sound of a trumpet,
Revelation 16:17
Then the seventh angel poured out his bowl into the air, and a loud voice came out of the temple from the throne [of God], saying, “It is done. [It is all over, it is all accomplished, it has come.]”

And i

Revelation 1:19
So write the things which you have seen [in the vision], and the things which are [now happening], and the things which will take place after these things.
Revelation 22:6
Then he said to me, “These words are faithful and true.” And the Lord, the God of the spirits of the prophets, has sent His angel [as a representative] to show His bond-servants the things that must soon take place.
John 16:13
But when He, the Spirit of Truth, comes, He will guide you into all the truth [full and complete truth]. For He will not speak on His own initiative, but He will speak whatever He hears [from the Father—the message regarding the Son], and He will disclose to you what is to come [in the future].