1Thessalonians 4:
13 But I would not have you to be ignorant, brethren, concerning them which are asleep, that ye sorrow not, even as others which have no hope.
14 For if we believe that Jesus died and rose again, even so them also which sleep in Jesus will God bring with him.
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.
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:
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.
18 Wherefore comfort one another with these words.
No one has ever entered the third Heaven where God sits on His throne. Third Heaven is where God and the holy angels and spirits of just men dwell. It is called “The heaven of heavens,” Deuteronomy 10:14; 1 Kings 8:27; Psalms 115:16; 148:4; 1Kings 8:27; Psalms 2:4; John 3:13
Jesus only returns once on the last day, John 5:28, 29; 6:40, and at that time will destroy the beast and false prophet casting them into the lake of fire, Rev 19:11-21. Jesus will then send His angels out to the four corners of the earth to gather together those who are His own as the door of salvation is then closed forever and final judgment made, Matthew 24:29-31.
Revelation 22:
11 He that is unjust, let him be unjust still: and he which is filthy, let him be filthy still: and he that is righteous, let him be righteous still: and he that is holy, let him be holy still.
12 And, behold, I come quickly; and my reward is with me, to give every man according as his work shall be.
13 I am Alpha and Omega, the beginning and the end, the first and the last.
14 Blessed are they that do his commandments, that they may have right to the tree of life, and may enter in through the gates into the city.