Thessalonians is used for the pre-trib rapture view.
But when you read through the whole narrative of the Thessalonian letters we see that they are suffering from hardships and being heavily accused and persecuted from both sides, pagan Gentiles and Christ rejecting Jews alike.
In other words, they are being persecuted by every nation (Israel and Gentile), ie. the whole world.
Paul extorts them to stand fast in their faith through the persecutions, endure through the persecutions, and be assured that their reward will be great
when the Day of the Lord comes to judge the nations and put an end to the accusers and persecutors.
2 Thessalonians 1 ESV
(5) This is evidence of the righteous judgment of God, that you may be considered worthy of the kingdom of God, for which you are also suffering—
(6) since indeed God considers it just to repay with affliction those who afflict you,
(7) and to grant relief to you who are afflicted as well as to us, when the Lord Jesus is revealed from heaven with his mighty angels
(8) in flaming fire, inflicting vengeance on those who do not know God and on those who do not obey the gospel of our Lord Jesus.
(9) They will suffer the punishment of eternal destruction, away from the presence of the Lord and from the glory of his might,
This is Paul speaking to the persecuted
Church (the body of Christ) and telling them
when the persecuted body of Christ will get their relief.
The Thessalonian letters do not depict a Church that will not be here through troubled times, and it does not depict that their suffering will end until the time
when the Lord returns in flaming fire, inflicting vengeance on the accusers and persecutors.
Paul's message to the
Church is for them to endure, stand fast, and keep the faith until that day arrives
when Christ returns to give them relief.