The Thessalonians, having received apostles Paul's first letter needed some clarity, they wanted to know if the day of the Lord, which is Jesus' second coming, if it already began? Paul's response is to point them to the role the antichrist will play as the events that heralds Jesus' second coming unfolds. "Now, dear brothers and sisters, let us clarify some things about the coming of our Lord Jesus Christ and how we will be gathered to meet him. Don’t be so easily shaken or alarmed by those who say that the day of the Lord has already begun. Don’t believe them, even if they claim to have had a spiritual vision, a revelation, or a letter supposedly from us. Don’t be fooled by what they say. For that day will not come until there is a great rebellion against God and the man of lawlessness is revealed—the one who brings destruction.
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2 Thessalonians 2:1-3 NLT. In our previous studies, we've said that there are actually 2 second comings of Jesus each separated by this man. The first is often referred to as the day of rapture. Paul also mentions some of the things he, the antichrist would do; "He will exalt himself and defy everything that people call god and every object of worship. He will even sit in the temple of God, claiming that he himself is God.
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2 Thessalonians 2:4 NLT. This particular event is the abomination of desolation Daniel the prophet spoke about in; Dan 9:27; 11:31; 12:11-12. "The ruler will make a treaty with the people for a period of one set of seven, but after half this time, he will put an end to the sacrifices and offerings. And as a climax to all his terrible deeds, he will set up a sacrilegious object that causes desecration, until the fate decreed for this defiler is finally poured out on him.”
Daniel 9:27 NLT. One set of 7 is 7 years. Half that time is 3 and a half years. Daniel says this man will enter into a treaty with Israel and 3 and a half years into that treaty, he will break his covenant and wnter the temple. “His army will take over the Temple fortress, pollute the sanctuary, put a stop to the daily sacrifices, and set up the sacrilegious object that causes desecration.
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Daniel 11:31 NLT. “From the time the daily sacrifice is stopped and the sacrilegious object that causes desecration is set up to be worshiped, there will be 1,290 days. And blessed are those who wait and remain until the end of the 1,335 days!
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Daniel 12:11-12 NLT. Jesus Christ also spoke about these events; “The day is coming when you will see what Daniel the prophet spoke about—the sacrilegious object that causes desecration standing in the Holy Place.” (Reader, pay attention!) “Then those in Judea must flee to the hills. A person out on the deck of a roof must not go down into the house to pack. A person out in the field must not return even to get a coat. How terrible it will be for pregnant women and for nursing mothers in those days. And pray that your flight will not be in winter or on the Sabbath. For there will be greater anguish than at any time since the world began. And it will never be so great again. In fact, unless that time of calamity is shortened, not a single person will survive. But it will be shortened for the sake of God’s chosen ones. “Then if anyone tells you, ‘Look, here is the Messiah,’ or ‘There he is,’ don’t believe it. For false messiahs and false prophets will rise up and perform great signs and wonders so as to deceive, if possible, even God’s chosen ones. See, I have warned you about this ahead of time.
Matthew 24:15-25 NLT. Interpretation; if you witness this man's appearance and the things he begins to do, you are right in the midst of the 7 years of great tribulation. Jesus says, hide yourself at this moment because the prophet Daniel says it would be 3 and the half years from when the abomination that causes desolation appears to when Christ eventually returns.