2 Thessalonians 2:3

For the Day will not come until. Paul had already told them about this (see 2 Thessalonians 2:5). But no one has any way of knowing just what Paul said to them. The final Rebellion takes place. Protestant churchmen have traditionally identified this Rebellion as an apostasy to be identified with the Roman Church. But in 2 Thessalonians 2:8 the appearance of the Wicked One and the Coming of the Lord Jesus seem very close in time. 2 Thessalonians 2:7 tells us the Mysterious Wickedness is already at work [over 1,900 years ago as Paul writes this]. I think the Mysterious Wickedness is to be identified with the false prophet (see Revelation 13:11); and the Wicked One and the final Rebellion to the time when Satan is set loose for a little while (see Revelation 11:7; Revelation 20:7-10 and notes).