Rapture & verses that prove it is Post-Tribulation
2 Thessalonians 2:1-12
In 2 Thessalonians 2:1–12, Paul corrects the belief that the Day of the Lord had already occurred, urging believers not to be alarmed by false reports. He explains that this day will not arrive until a widespread apostasy occurs and the "man of lawlessness" is revealed, who will then be destroyed by Jesus at his return.
This passage highlights that the lawless one will utilize satanic power to deceive those who rejected the truth. Because of their refusal to embrace the truth, God allows a strong delusion to affect those who ultimately face condemnation.