^ The first two verses of that chapter are enough to establish the fact:
2Th 2:1
Now we beseech you, brethren, by [G5228 - huper / hyper] the coming of our Lord Jesus Christ, and by our gathering together unto him [i.e. when WE go UP],
2Th 2:2
That ye be not soon shaken in mind, or be troubled [ throeisthai - 'in Greek writings to cry aloud, make a noise by outcry' ... 'alarmed'], neither by spirit, nor by word, nor by letter as from us, as that [/purporting that] the day of the Lord [/tribulation period of judgments unfolding] is present / is already here [G1764 - enestēken /enistēmi ; PERFECT INDICATIVE; TRANSITIVE verb in the Greek].
https://www.blueletterbible.org/kjv/2th/2/1/ss1/s_1118001
https://www.blueletterbible.org/kjv/2th/2/1/ss1/t_concif_1118002
I find that many folks do not grasp just what the "false claim" in verse 2 (Paul was talking to them about here) pertained / pertains to [/is claiming], and thus they miss the import of these two verses, even.
To the Thessalonians (who were experiencing what 2Th1:4 says, "tribulations and persecutions that YE ENDURE"), such a claim (though false) would be something perfectly believable and reasonable... not be something they had ZERO EVIDENCE about.
2Th 2:1
Now we beseech you, brethren, by [G5228 - huper / hyper] the coming of our Lord Jesus Christ, and by our gathering together unto him [i.e. when WE go UP],
2Th 2:2
That ye be not soon shaken in mind, or be troubled [ throeisthai - 'in Greek writings to cry aloud, make a noise by outcry' ... 'alarmed'], neither by spirit, nor by word, nor by letter as from us, as that [/purporting that] the day of the Lord [/tribulation period of judgments unfolding] is present / is already here [G1764 - enestēken /enistēmi ; PERFECT INDICATIVE; TRANSITIVE verb in the Greek].
https://www.blueletterbible.org/kjv/2th/2/1/ss1/s_1118001
https://www.blueletterbible.org/kjv/2th/2/1/ss1/t_concif_1118002
I find that many folks do not grasp just what the "false claim" in verse 2 (Paul was talking to them about here) pertained / pertains to [/is claiming], and thus they miss the import of these two verses, even.
To the Thessalonians (who were experiencing what 2Th1:4 says, "tribulations and persecutions that YE ENDURE"), such a claim (though false) would be something perfectly believable and reasonable... not be something they had ZERO EVIDENCE about.