Revelation 4:1 shows the pre tribulation rapture

Revelation 4:1 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.
Revelation 4:2 And immediately I was in the spirit: and, behold, a throne was set in heaven, and one sat on the throne.

(1) First phrase, "after this I looked"... similar to:

Luke 21:28 And when these things begin to come to pass, then look up, and lift up your heads; for your redemption draweth nigh.

(2) Second phrase, "and, behold, a door was opened in heaven:" In context, we see an open door promised to the Church that was given a specific promise: to be kept out of tribulation.

[Rev 3:8] I know thy works: behold, I have set before thee an open door, and no man can shut it: for thou hast a little strength, and hast kept my word, and hast not denied my name.

[Rev 3:10] Because you have kept my word of patient endurance, I will keep you from the hour of trial which is coming on the whole world, to try those who dwell upon the earth.

Revelation 3:20 Behold, I stand at the door, and knock: if any man hear my voice, and open the door, I will come in to him, and will sup with him, and he with me.

Further, this "open door" is referred to in other texts which mention going to be with our bridegroom, and those who will not:

From Mat 25:1-13, the ten virgins parable:

[Mat 25:10] And while they went to buy, the bridegroom came; and they that were ready went in with him to the marriage: and the door was shut.
[Mat 25:11] Afterward came also the other virgins, saying, Lord, Lord, open to us.
[Mat 25:12] But he answered and said, Verily I say unto you, I know you not.
[Mat 25:13] Watch therefore, for ye know neither the day nor the hour wherein the Son of man cometh.

Luke 13:

23 Then said one unto him, Lord, are there few that be saved? And he said unto them,
24 Strive to enter in at the strait gate: for many, I say unto you, will seek to enter in, and shall not be able.
25 When once the master of the house is risen up, and hath shut to the door, and ye 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 whence ye are:
26 Then shall ye begin to say, We have eaten and drunk in thy presence, and thou hast taught in our streets.
27 But he shall say, I tell you, I know you not whence ye are; depart from me, all ye workers of iniquity.
28 There shall be weeping and gnashing of teeth, when ye shall see Abraham, and Isaac, and Jacob, and all the prophets, in the kingdom of God, and you yourselves thrust out.
29 And they shall come from the east, and from the west, and from the north, and from the south, and shall sit down in the kingdom of God.
30 And, behold, there are last which shall be first, and there are first which shall be last.

This "open door/gate" into heavenly places in figured on the Feast of Trumpets, which has numerous rapture parallels. Even the most uninformed non-Christian has the concept that there are gates through which one must enter to get into heaven. Commonly called the "pearly gates" from that description of New Jerusalem.

[Ezek 46:1] "Thus says the Lord GOD: The gate of the inner court that faces east shall be shut on the six working days; but on the sabbath day it shall be opened and on the day of the new moon it shall be opened.

[Isa 26:2] Open ye the gates, that the righteous nation which keepeth the truth may enter in.

[Pss 118:19] Open to me the gates of righteousness: I will go into them, and I will praise the LORD:
[Pss 118:20] This gate of the LORD, into which the righteous shall enter.

[John 10:7] Then said Jesus unto them again, Verily, verily, I say unto you, I am the door of the sheep.
[John 10:9] I am the door: by me if any man enter in, he shall be saved, and shall go in and out, and find pasture.

(3) Third phrase: "and the first voice which I heard was as it were of a trumpet talking with me" It's a "trumpet and a voice" in 1 Thess 4.

[1 Thessalonians 4:16] For the Lord himself shall descend from heaven with a shout, with the voice of the archangel, and with the trump of God: and the dead in Christ shall rise first:

In the NIV it's a little different, it's a "loud command" not just a "shout", and there is no comma between the voice of the archangel and the trumpet call of God, as if they may be one and the same.

1 Thessalonians 4:16 For the Lord himself will come down from heaven, with a loud command, with the voice of the archangel and with the trumpet call of God, and the dead in Christ will rise first.

A verse in Rev. 1 is also describes the "trumpet voice", and confirms the fact that John was in the spirit while receiving the Revelation of Jesus Christ.

Revelation 1:10 I was in the Spirit on the Lord's day, and heard behind me a great voice, as of a trumpet,

(4) Fourth phrase, "which said, Come up hither" --The same phrase is used in describing the rapture of the two witnesses in Rev. 11, which "ascended up to heaven in a cloud".

Revelation 11:12 And they heard a great voice from heaven saying unto them, Come up hither. And they ascended up to heaven in a cloud; and their enemies beheld them.

In Greek, the phrase "come up hither" is the words "come up" = anabaino, and "hither" = hode.

And anabaino is used twice in Rev. 11, and translated as "they ascended up" the second time.

From Strong's:
305 anabaino {an-ab-ah'-ee-no}
from 303 and the base of 939; TDNT - 1:519,90; v
AV - go up 37, come up 10, ascend 10, ascend up 8, climb up 2,
spring up 2, grow up 2, come 2, enter 2, arise 2, rise up 2,
misc 2, vr ascend 1; 82
1) ascend
1a) to go up
1b) to rise, mount, be borne up, spring up

5602 hode {ho'-deh}
from an adverb form of 3592;; adv
AV - here 44, hither 13, in this place 1, this place 1, there 1; 60
1) here, to this place, etc.

The only time in the Greek Scriptures where "anabaino hode" or "come up hither" are used together is in Rev. 4:1, and Rev. 11:12. We must compare scripture with scripture, and both scriptures describe a rapture. A voice calling from heaven saying "come up here" is a rapture into heaven.

(5) Fifth phrase: "and I will shew thee things which must be hereafter."

And so, we can easily conclude from comparing scripture to scripture, that the rapture is pre tribulation, before all "the things which must be hereafter" that are in the vision of the Revelation of our Lord Jesus Christ.

(6) Sixth phrase: (beginning Rev. 2): "And immediately I was in the spirit". As we have seen, this phrase was also associated with the trumpet voice of Rev. 4:1 at the beginning of Revelation.

Revelation 1:10 I was in the Spirit on the Lord's day, and heard behind me a great voice, as of a trumpet,

(7) Seventh phrase: "and, behold, a throne was set in heaven, and one sat on the throne." Finally reaffirming the location being spoken of is heaven. When the Lord said "come up here", the Lord wasn't at the top of a hill, the Lord was in heaven.

To say that Rev. 4:1 is anything other than a rapture into heaven is to ignore the body of scripture.

The Revelation was given to John. The rapture in Rev. 4:1 happened to John.

The Revelation was also given to all who read and hear the Book of Revelation for themselves.

Revelation 1:3 Blessed is he that readeth, and they that hear the words of this prophecy, and keep those things which are written therein: for the time is at hand.

The rapture is also given to all who are found faithful to believe in Christ, as 1/7 of the Churches in Rev 2-3, and 1/2 of the 10 virgins in Matt 25.

[1 Thessalonians 4:15] For this we say unto you by the word of the Lord, that we which are alive and remain unto the coming of the Lord shall not prevent them which are asleep.
[1 Thessalonians 4:16] For the Lord himself shall descend from heaven with a shout, with the voice of the archangel, and with the trump of God: and the dead in Christ shall rise first:
[1 Thessalonians 4:17] Then we which are alive and remain shall be caught up together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord. [caught up=HARPAZO=Rapture]
[1 Thessalonians 4:18] Therefore comfort one another with these words.

[1 Thessalonians 1:10] And to wait for his Son from heaven, whom he raised from the dead, even Jesus, which delivered us from the wrath to come.
[1 Thessalonians 5:9] For God hath not appointed us to wrath, but to obtain salvation by our Lord Jesus Christ,

[1Cor 15:51] Behold, I shew you a mystery; We shall not all sleep, but we shall all be changed,
[1Cor 15:52] In a moment, in the twinkling of an eye, at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed.
[1Cor 15:53] For this corruptible must put on incorruption, and this mortal must put on immortality.
[1Cor 15:54] So when this corruptible shall have put on incorruption, and this mortal shall have put on immortality, then shall be brought to pass the saying that is written, Death is swallowed up in victory.
[1Cor 15:55] O death, where is thy sting? O grave, where is thy victory?

The righteousness of faith does not argue over who will ascend into heaven; whether it was just for John in Rev. 4:1, or for all believers.

[Rom 10:6] But the righteousness which is of faith speaketh on this wise, Say not in thine heart, Who shall ascend into heaven? (that is, to bring Christ down from above:)
[Rom 10:7] Or, Who shall descend into the deep? (that is, to bring up Christ again from the dead.)
[Rom 10:8] But what saith it? The word is nigh thee, even in thy mouth, and in thy heart: that is, the word of faith, which we preach;
[Rom 10:9] That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.
[Rom 10:10] For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation. l>