Let no man deceive you by any means: {3} for that day shall not come, except there come a falling away first, and {e} that man of sin be revealed, the son of perdition;

(3) The apostle foretells that before the coming of the Lord, there will be a throne set up completely contrary to Christ's glory, in which that wicked man will sit, and transfer all things that appertain to God to himself: and many will fall away from God to him.

(e) By speaking of one, he singles out the person of the tyrannous and persecuting antichrist.

People's New Testament

2:3 Except there come a falling away first. An apostasy must precede the Coming. That is, there shall be a general falling away from the purity of the faith. No apostasy of magnitude occurred in the history of the church for centuries, which could answer to Paul's description, but the gradual declension, corruption, and departure from the ancient faith, which was fully developed a few hundred years later, has always been spoken of by Protestant church historians as The Apostasy. There is no good reason for doubting that it is to the apostle refers.

And that man of sin be revealed. He shall be revealed then in connection with the apostasy.

The son of perdition. This expression occurs once elsewhere, and is there applied to Judas, an apostate (Joh 17:12). Here it evidently has a similar application. Some power, once Christian, falls away and becomes opposed to Christ.

Wesley's Notes

2:3 Unless the falling away - From the pure faith of the gospel, come first. This began even in the apostolic age. But the man of sin, the son of perdition - Eminently so called, is not come yet. However, in many respects, the Pope has an indisputable claim to those titles. He is, in an emphatical sense, the man of sin, as he increases all manner of sin above measure. And he is, too, properly styled, the son of perdition, as he has caused the death of numberless multitudes, both of his opposers and followers, destroyed innumerable souls, and will himself perish everlastingly. He it is that opposeth himself to the emperor, once his rightful sovereign; and that exalteth himself above all that is called God, or that is worshipped - Commanding angels, and putting kings under his feet, both of whom are called gods in scripture; claiming the highest power, the highest honour; suffering himself, not once only, to be styled God or vice - god. Indeed no less is implied in his ordinary title, Most Holy Lord, or, Most Holy Father. So that he sitteth - Enthroned. In the temple of God - Mentioned Rev 11:1. Declaring himself that he is God - Claiming the prerogatives which belong to God alone.

Scofield Reference Notes

[1] for that day

The order of events is:

(1) The working of the mystery of lawlessness under divine restraint which had already begun in the apostle's time 2Th 2:7

(2) the apostasy of the professing church 2Th 1:3 Lk 18:8 2Tim 3:1-8.

(3) the removal of that which restrains the mystery of lawlessness 2Th 2:6,7. The restrainer is a person--"he," and since a "mystery" always implies a supernatural element See Scofield Note: "Mt 13:11" this Person can be none other than the Holy Spirit in the church, to be "taken out of the way" 2Th 2:7 1Th 4:14-17.

(4) the manifestation of the lawless one 2Th 2:8-10 Dan 7:8 9:27 Mt 24:15 Rev 13:2-10

(5) the coming of Christ in glory and the destruction of the lawless one 2Th 2:8 Rev 19:11-21

(6) the day of Jehovah 2Th 2:9-12 Isa 2:12

Jamieson-Fausset-Brown Bible Commentary

3. by any means-Greek, "in any manner." Christ, in Mt 24:4, gives the same warning in connection with the same event. He had indicated three ways (2Th 2:2) in which they might be deceived (compare other ways, 2Th 2:9, and Mt 24:5, 24).

a falling away-rather as the Greek, "the falling away," or "apostasy," namely, the one of which "I told you" before (2Th 2:5), "when I was yet with you," and of which the Lord gave some intimation (Mt 24:10-12; Joh 5:43).

that man of sin be revealed-The Greek order is, "And there have been revealed the man of sin." As Christ was first in mystery, and afterwards revealed (1Ti 3:16), so Antichrist (the term used 1Jo 2:18; 4:3) is first in mystery, and afterwards shall be developed and revealed (2Th 2:7-9). As righteousness found its embodiment in Christ, "the Lord our righteousness," so "sin" shall have its embodiment in "the man of sin." The hindering power meanwhile restrains its manifestation; when that shall be removed, then this manifestation shall take place. The articles, "the apostasy," and "the man of sin," may also refer to their being well known as foretold in Da 7:8, 25, "the little horn speaking great words against the Most High, and thinking to change times and laws"; and Da 11:36, the wilful king who "shall exalt and magnify himself above every god, and shall speak marvellous things against the God of gods; neither shall he regard any god."

the son of perdition-a title applied besides to Judas (the traitor, Joh 17:12), and to none else. Antichrist (the second "beast" coming up out of the earth); therefore he shall at first be "like a lamb, while he speaks as a dragon" (Re 13:11); "coming in peaceably and by flatteries," "working deceitfully," but "his heart shall be against the holy covenant" (Da 11:21, 23, 28, 30). Seeds of "the falling away" soon appear (1Ti 4:1-3), but the full development and concentration of these anti-Christian elements in one person are still to appear. Contrast the King of Zion's coming as Jesus: (1) righteous or just; (2) having salvation; (3) lowly; whereas Antichrist is: (1) "the man of (the embodiment of) sin; (2) the son of perdition; (3) exalting himself above all that is worshipped. He is the son of perdition, as consigning many to it, and finally doomed to it himself (Re 17:8, 11). "He whose essence and inheritance is perdition" [Alford]. As "the kingdom of heaven" is first brought before us in the abstract, then in the concrete, the King, the Lord Jesus; so here, first we have (2Th 2:7) "the mystery of iniquity," then "the iniquitous one" (2Th 2:8). Doubtless "the apostasy" of Romanism (the abstract) is one of the greatest instances of the working of the mystery of iniquity, and its blasphemous claims for the Pope (the concrete) are forerunners of the final concentration of blasphemy in the man of sin, who shall not merely, as the Pope, usurp God's honor as vicegerent of God, but oppose God openly at last.

Matthew Henry's Concise Commentary

2:1-4 If errors arise among Christians, we should set them right; and good men will be careful to suppress errors which rise from mistaking their words and actions. We have a cunning adversary, who watches to do mischief, and will promote errors, even by the words of Scripture. Whatever uncertainty we are in, or whatever mistakes may arise about the time of Christ's coming, that coming itself is certain. This has been the faith and hope of all Christians, in all ages of the church; it was the faith and hope of the Old Testament saints. All believers shall be gathered together to Christ, to be with him, and to be happy in his presence for ever. We should firmly believe the second coming of Christ; but there was danger lest the Thessalonians, being mistaken as to the time, should question the truth or certainty of the thing itself. False doctrines are like the winds that toss the water to and fro; and they unsettle the minds of men, which are as unstable as water. It is enough for us to know that our Lord will come, and will gather all his saints unto him. A reason why they should not expect the coming of Christ, as at hand, is given. There would be a general falling away first, such as would occasion the rise of antichrist, that man of sin. There have been great disputes who or what is intended by this man of sin and son of perdition. The man of sin not only practises wickedness, but also promotes and commands sin and wickedness in others; and is the son of perdition, because he is devoted to certain destruction, and is the instrument to destroy many others, both in soul and body. As God was in the temple of old, and worshipped there, and is in and with his church now; so the antichrist here mentioned, is a usurper of God's authority in the Christian church, who claims Divine honours.