It is all very quick, sudden destruction takes place when Christ returns
Please read the whole chapter for relevance of this
Christ died for us, so when Christ returns, we are preserved and they are suddenly destroyed, along with that world, not 1000 years later.
We are going to be glorified together with Christ if we are of His body.
v23 also verifies this even as the return of our Lord.
The 'comfort' Paul mentions, is God will preserve us who belong to Him. We are not suddenly destroyed as they are.
v27 mentions this must be read to all the brethren it is not a private teaching and it is important teaching.
Some are unruly and some must not be submitting to the Lord's apostolic teaching about that time to come. v27.
Paul wants them all to know the truth about what will happen when Christ returns.
1 Thess 5
The Day of the Lord
But concerning the times and the seasons, brethren, you have no need that I should write to you. 2
For you yourselves know perfectly that the day of the Lord so comes as a thief in the night. 3 For when they say, “Peace and safety!” then sudden destruction comes upon them, as labor pains upon a pregnant woman. And they shall not escape. 4 But you, brethren, are not in darkness, so that this Day should overtake you as a thief. 5 You are all sons of light and sons of the day. We are not of the night nor of darkness. 6 Therefore let us not sleep, as others
do, but let us watch and be [
a]sober. 7 For those who sleep, sleep at night, and those who get drunk are drunk at night. 8 But let us who are of the day be sober, putting on the breastplate of faith and love, and
as a helmet the hope of salvation. 9
For God did not appoint us to wrath, but to obtain salvation through our Lord Jesus Christ, 10 who died for us, that whether we wake or sleep, we should live together with Him.
11 Therefore [
b]comfort each other and [
c]edify one another, just as you also are doing.
Various Exhortations
12 And we urge you, brethren, to recognize those who labor among you, and are over you in the Lord and [
d]admonish you, 13 and to esteem them very highly in love for their work’s sake. Be at peace among yourselves.
14 Now we [
e]exhort you, brethren, warn those who are [
f]unruly, comfort the fainthearted, uphold the weak, be patient with all. 15 See that no one renders evil for evil to anyone, but always pursue what is good both for yourselves and for all.
16 Rejoice always, 17 pray without ceasing, 18 in everything give thanks; for this is the will of God in Christ Jesus for you.
19 Do not quench the Spirit. 20 Do not despise prophecies. 21 Test all things; hold fast what is good. 22 Abstain from every form of evil.
Blessing and Admonition
23 Now may the God of peace Himself sanctify[g] you completely; and may your whole spirit, soul, and body be preserved blameless at the coming of our Lord Jesus Christ. 24 He who calls you is faithful, who also will do it.
25 Brethren, pray for us.
26 Greet all the brethren with a holy kiss.
27
I charge you by the Lord that this [h]epistle be read to all the [i]holy brethren.
28 The grace of our Lord Jesus Christ
be with you. Amen.