An open door

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Revelation 4:1, John wrote, I looked, and behold, a door was open 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 show thee things which must be hereafter.”

Several questions emerge after reading the verse. Was John looking into the third heaven, where the Father’s throne is? Was seeing the door open, an invitation for him to enter?

Who was speaking to John? And who was going to reveal the future to him?

Nowhere else in the Scriptures does it speak of an open door in heaven, except here. Other verses speak of the heavens being opened, but never an open door.
Ezekiel 1:1, “The heavens were opened.”
Matthew 3:16, “The heavens were opened”
Acts 7:56, “I saw the heavens opened.”
Acts 10:11, “And saw the heavens opened.” In each of these visions, what these men saw was disclosed to them on earth from heaven.

But here, the door had already been opened. Metaphorically it means access, an opportunity to pass through.

In John 10:7-9, Jesus said, “I am the door: by me if any man enters in, he shall be saved, and shall go in and out, and find pasture.”

John was invited, he entered, he saw, and he left.

“The first voice which I heard was as it were of a trumpet talking with me.” Who did this voice belong to? Let’s compare the above with,
Revelation 1:10, John writes, “I was in the Spirit on the Lord’s day, and heard behind me a great voice, as of a trumpet.”

The voice was that of the Alpha and Omega, Jesus Christ. Jesus invited John to enter the open door that took him to the throne of his Father.
“Come up hither.” “Immediately I (John) was in the Spirit: and, behold, a throne was set in heaven, and one sat on the throne.”
Was John's entrance into heaven a preview of the coming “Rapture” of believers?

[1213]

Revelation 4:1, John wrote, I looked, and behold, a door was open 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 show thee things which must be hereafter.”

Several questions emerge after reading the verse. Was John looking into the third heaven, where the Father’s throne is? Was seeing the door open, an invitation for him to enter?

Who was speaking to John? And who was going to reveal the future to him?

I have understood the speaker with "trumped sound" is Jesus. And ultimately the revelation was given by God, according to the text:

The Revelation of Jesus Christ, which God gave unto him,
Rev. 1:1

Nowhere else in the Scriptures does it speak of an open door in heaven, except here. Other verses speak of the heavens being opened, but never an open door.
Ezekiel 1:1, “The heavens were opened.”...

Being opened implies there is a door. Or was it window that was open? Or what do you think it means heavens were open, if no door?

Was John's entrance into heaven a preview of the coming “Rapture” of believers?

I don't think Bible is speaking of rapture. But, maybe there is something similar to resurrection, at least to what one can see then.

[placebofactor]

Revelation 4:1, John wrote, I looked, and behold, a door was open 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 show thee things which must be hereafter.”

Several questions emerge after reading the verse. Was John looking into the third heaven, where the Father’s throne is? Was seeing the door open, an invitation for him to enter?

Who was speaking to John? And who was going to reveal the future to him?

I have understood the speaker with "trumped sound" is Jesus. And ultimately the revelation was given by God, according to the text:

That is correct.

The Revelation of Jesus Christ, which God gave unto him,
Rev. 1:1

Nowhere else in the Scriptures does it speak of an open door in heaven, except here. Other verses speak of the heavens being opened, but never an open door.
Ezekiel 1:1, “The heavens were opened.”...

Being opened implies there is a door. Or was it window that was open? Or what do you think it means heavens were open, if no door

According to the scriptures, a vision is the appearance of something supernatural presented to the mind of a prophet by which they were informed of future events. Such were the visions of Amos, Isaiah, and Ezekiel.

Was John's entrance into heaven a preview of the coming “Rapture” of believers?

I don't think Bible is speaking of rapture. But, maybe there is something similar to resurrection, at least to what one can see then.

The meaning of resurrection is to be raised from death to life. This was not the case with John in Revelation 4:1.

I believe what we are being told of John's journey is a preview of 1 Thessalonians 4:17, we, both those who died in Christ and those who are alive when he comes, "shall be caught up together in the clouds, to meet the Lord (Jesus) in the air: and so shall we forever be with the Lord." The bride meets the bridegroom, Revelation 9:7, "For the marriage of the Lamb is come, and his wife (Believing Christians) has made herself ready."

John found himself in heaven, where he was shown what was going to happen in the future. What he was seeing had already been predetermined in heaven by the counsel of God, and as a result of what he saw and heard, John wrote with great authority. John was in the Spirit, then caught up in the third heaven, wholly under Divine influence. Only through his belief in the finished work of the Son of God was John able to pass through that open door.

[placebofactor]

Revelation 4:1, John wrote, I looked, and behold, a door was open 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 show thee things which must be hereafter.”

Several questions emerge after reading the verse. Was John looking into the third heaven, where the Father’s throne is? Was seeing the door open, an invitation for him to enter?

Who was speaking to John? And who was going to reveal the future to him?

Nowhere else in the Scriptures does it speak of an open door in heaven, except here. Other verses speak of the heavens being opened, but never an open door.
Ezekiel 1:1, “The heavens were opened.”
Matthew 3:16, “The heavens were opened”
Acts 7:56, “I saw the heavens opened.”
Acts 10:11, “And saw the heavens opened.” In each of these visions, what these men saw was disclosed to them on earth from heaven.

But here, the door had already been opened. Metaphorically it means access, an opportunity to pass through.

In John 10:7-9, Jesus said, “I am the door: by me if any man enters in, he shall be saved, and shall go in and out, and find pasture.”

John was invited, he entered, he saw, and he left.

“The first voice which I heard was as it were of a trumpet talking with me.” Who did this voice belong to? Let’s compare the above with,
Revelation 1:10, John writes, “I was in the Spirit on the Lord’s day, and heard behind me a great voice, as of a trumpet.”

The voice was that of the Alpha and Omega, Jesus Christ. Jesus invited John to enter the open door that took him to the throne of his Father.
“Come up hither.” “Immediately I (John) was in the Spirit: and, behold, a throne was set in heaven, and one sat on the throne.”
Was John's entrance into heaven a preview of the coming “Rapture” of believers?

Because we are living in the last days, this generation of Jews Matthews said will not pass away is 77 years old. The door to the throne of our Savior is open for all men, but the time is short.

Luke 13:25, Jesus said, "Once the master of the house is risen up, and hath shut to the door, and you begin to stand without, and to knock at the door, saying, Lord, Lord, open unto us; and he shall answer and say unto you, I know you not."

One thousand times God's bell tolls and we answer or disobey, "Never send to know for whom the bell tolls; it tolls for thee." by John Donne

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[Replying to placebofactor in post #4]

In a wilderness area somewhere in the foothills of Israel a shepherd is tending his flock. Night’s falling as the shepherd leads his flock to a safe place, a place prepared beforehand. It’s a place of rest, water, and food for his sheep. A small opening into the enclosure has been made for the sheep to go through, and as they enter the shepherd counts his sheep, when the full number is reached, he sits at the door.

From this picture, David drew Psalms 23:1, "The Lord is my shepherd; I shall not want. He maketh me to lie down in green pastures: he leadeth me beside the still waters."

If the sheep were to be attacked by wolves, or thieves attempted to steal them away, they would have to get by the shepherd at the door.

"I (Jesus) am the good shepherd: the good shepherd giveth his life for the sheep."

The Lord then paints for us a clear picture of those who try to enter not by the door into the sheepfold, but climb in some other way, the same are thieves and a robber.

"He that is a hireling, and not the shepherd, whose own the sheep are not, sees the wolf coming, and leaves the sheep and flees: and the wolf catches them, and scatters the sheep.

False teachers, liars, who care not for the sheep. They feed their greed while imparting fear into the sheep.

"But he that enters in (the sheepfold) enters in by the door is the shepherd of the sheep."

Jesus said, "I am the door: by me if any man enter in, he shall be saved, and shall go in and out, and find pasture.