Let no one deceive you in any way. For it will not be, unless the departure comes first, and the man of sin is revealed, the son of destruction,
That man of sin, that son of perdition--The article, joined to these appellations, is emphatic, as in the former clause importing that the ancient prophets had spoken of these persons, though under different names; particularly the prophet Daniel, whose descriptions of the little horn and blasphemous king agree so exactly in meaning with Paul’s descriptions of the man of sin, and the son of perdition, and lawless one, that there can be little doubt of their being the same persons. But this will best appear a comparison of the passage (MacKnight 428).