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In flaming fire - Εν φλογι πυρος· In thunder and lightning, taking vengeance - inflicting just punishment on them that know not God - the heathen who do not worship the true God, and will not acknowledge him, but worship idols; and on them that obey not the Gospel - the Jews, particularly who have rejected the Gospel, and persecuted Christ and his messengers; and all nominal Christians who, though they believe the Gospel as a revelation from God, yet do not obey it as a rule of life.

In flaming fire--Greek, "In flame of fire"; or, as other oldest manuscripts read, "in fire of flame." This flame of fire accompanied His manifestation in the bush (Exo 3:2); also His giving of the law at Sinai (Exo 19:18). Also it shall accompany His revelation at His advent (Dan 7:9-10), symbolizing His own bright glory and His consuming vengeance against His foes (Heb 10:27; Heb 12:29; Pe2 3:7, Pe2 3:10). taking--literally, "giving" them, as their portion, "vengeance." know not God--the Gentiles primarily (Psa 79:6; Gal 4:8; Th1 4:5); not of course those involuntarily not knowing God, but those wilfully not knowing Him, as Pharaoh, who might have known God if he would, but who boasted "I know not the Lord" (Exo 5:2); and as the heathen persecutors who might have known God by the preaching of those whom they persecuted. Secondarily, all who "profess to know God but in works deny Him" (Tit 1:16). obey not the gospel--primarily the unbelieving Jews (Rom 10:3, Rom 10:16); secondarily, all who obey not the truth (Rom 2:8). Christ--omitted by some of the oldest manuscripts, and retained by others.

In flaming fire,.... Which may either refer to Christ, who will be revealed from heaven in such a manner; and whose coming will be as the lightning, not only sudden, but glorious, illustrious, and visible; he will be seen and easily discerned; there will be such a light and flaming fire about him, which, as it will serve to make him visible, will greatly add to the majesty of his appearance, and strike terror to his enemies, and burn them up round about; see Dan 7:7 or else it may refer to the angels, who shall descend in fiery forms, which is agreeably to their nature, Psa 104:4 and so they appeared in the forms of horses of fire, and chariots of fire, when Elijah was carried up to heaven. And it is a tradition of the Jews (z), that the angel Gabriel descended , "in a flame of fire", to burn Moses, as he was in the inn, when upon his journey from Midian to Egypt: or this clause may be read in construction with the following, as it is in the Vulgate Latin and Syriac versions, "in flaming fire taking vengeance"; and so expresses the manner in which vengeance will be taken on the wicked by Christ, the Judge of all, to whom it belongs: and the punishment of ungodly men is often signified by fire, and flames of fire, by the fire of hell, and a lake which burns with fire and brimstone, by a furnace of fire, everlasting fire, and fire that cannot be quenched, to set forth the endless torture and inconceivable misery of the damned; and it may be, some regard is had to the general conflagration, which will be at the coming of Christ, when the heavens, being on fire, shall be dissolved, the elements shall melt with fervent heat, and the earth, and all that is in it, shall be burnt up, when the bodies of the wicked, then living, will be consumed in flames of fire, and their souls…

After the introduction (Th2 1:1, Th2 1:2) the apostle begins this epistle with an account of his high esteem for these Thessalonians (Th2 1:3, Th2 1:4). He then comforts them under their afflictions and persecutions (Th2 1:5-10) and tells them what his prayers were to God for them (Th2 1:11, Th2 1:12).