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3Let no one deceive you in any way; for that day will not come, unless the rebellion comes first, and the man of lawlessness is revealed, the son of perdition, 4who opposes and exalts himself against every so-called god or object of worship, so that he takes his seat in the temple of God, proclaiming himself to be God. 5Do you not remember that when I was still with you I told you this? 6And you know what is restraining him now so that he may be revealed in his time. 7For the mystery of lawlessness is already at work; only he who now restrains it will do so until he is out of the way. 8And then the lawless one will be revealed, and the Lord Jesus will slay him with the breath of his mouth and destroy him by his appearing and his coming. 9The coming of the lawless one by the activity of Satan will be with all power and with pretended signs and wonders, 10and with all wicked deception for those who are to perish, because they refused to love the truth and so be saved. 11Therefore God sends upon them a strong delusion, to make them believe what is false, 12so that all may be condemned who did not believe the truth but had pleasure in unrighteousness.
2 Thessalonians 2:3-12 (RSV)