Revelation 4:1

After these things I saw a door open in heaven, and the first voice came to my ears, like the sound of a horn, saying, Come up here, and I will make clear to you the things which are to come.

Revelation 1:10

I was in the Spirit on the Lord's day, and a great voice at my back, as of a horn, came to my ears,

Revelation 1:19

Put in writing, then, the things which you have seen, and the things which are, and the things which will be after these;

Revelation 11:12

And a great voice from heaven came to their ears, saying to them, Come up here. And they went up into heaven in the cloud, and were seen by those desiring their death.

Revelation 22:6

And he said to me, These words are certain and true: and the Lord, the God of the spirits of the prophets, sent his angel to make clear to his servants the things which are now to come about.

Matthew 3:16

And Jesus, having been given baptism, straight away went up from the water; and, the heavens opening, he saw the Spirit of God coming down on him as a dove;

Mark 1:10

And straight away, coming up out of the water, he saw the heavens broken open and the Spirit coming down on him as a dove:

Luke 3:21

Now it came about that when all the people had been given baptism, Jesus, having had baptism with them, was in prayer, when, the heaven being open,

Acts 7:56

And he said, Now I see heaven open, and the Son of man at the right hand of God.

Acts 10:11

And he saw the heavens opening, and a vessel coming down, like a great cloth let down on the earth,

Revelation 16:17

And the seventh let what was in his vessel come out on the air; and there came out a great voice from the house of God, from the high seat, saying, It is done.

Exodus 1:1

Now these are the names of the sons of Israel who came into Egypt; every man and his family came with Jacob.

Exodus 19:24

And the Lord said to him, Go down, and you and Aaron may come up; but let not the priests and the people make their way through to the Lord, or he will come on them suddenly.

Exodus 24:12

And the Lord said to Moses, Come up to me on the mountain, and take your place there: and I will give you the stones on which I have put in writing the law and the orders, so that you may give the people knowledge of them.

Exodus 34:2-3

And be ready by the morning, and come up on Mount Sinai, and come before me there in the morning, on the top of the mountain.

John 16:13

However, when he, the Spirit of true knowledge, has come, he will be your guide into all true knowledge: for his words will not come from himself, but whatever has come to his hearing, that he will say: and he will make clear to you the things to come.

Revelation 1:1-3

The Revelation of Jesus Christ which God gave him so that his servants might have knowledge of the things which will quickly take place: and he sent and made it clear by 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

Exodus 1:1
Now these are the names of the sons of Israel who came into Egypt; every man and his family came with Jacob.
Matthew 3:16
And Jesus, having been given baptism, straight away went up from the water; and, the heavens opening, he saw the Spirit of God coming down on him as a dove;
Mark 1:10
And straight away, coming up out of the water, he saw the heavens broken open and the Spirit coming down on him as a dove:
Luke 3:21
Now it came about that when all the people had been given baptism, Jesus, having had baptism with them, was in prayer, when, the heaven being open,
Acts 7:56
And he said, Now I see heaven open, and the Son of man at the right hand of God.
Acts 10:11
And he saw the heavens opening, and a vessel coming down, like a great cloth let down on the earth,

The first

Revelation 1:10
I was in the Spirit on the Lord's day, and a great voice at my back, as of a horn, came to my ears,
Revelation 16:17
And the seventh let what was in his vessel come out on the air; and there came out a great voice from the house of God, from the high seat, saying, It is done.

And i

Revelation 1:19
Put in writing, then, the things which you have seen, and the things which are, and the things which will be after these;
Revelation 22:6
And he said to me, These words are certain and true: and the Lord, the God of the spirits of the prophets, sent his angel to make clear to his servants the things which are now to come about.
John 16:13
However, when he, the Spirit of true knowledge, has come, he will be your guide into all true knowledge: for his words will not come from himself, but whatever has come to his hearing, that he will say: and he will make clear to you the things to come.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain