2 Thessalonians 2:5-8

Don’t you remember that when I was with you I went over all these things? Now you are aware of the ruling power so that he may be fully revealed when his time comes. For the mystery of lawlessness is already active, but the one who prevails will do so until he is separated from out of the midst. Then the “outlaw” will be openly revealed, and the Lord will overthrow him by the breath of his mouth and bring him to an end by the dazzling manifestation of his presence.