Interlinear view shows the original Hebrew/Greek text with word-by-word translation (KJV).
1
Ἐρωτῶμεν ask δὲ but/and ὑμᾶς, you ἀδελφοί, brother ὑπὲρ above/for τῆς the/this/who παρουσίας coming τοῦ the/this/who κυρίου lord ἡμῶν I/we Ἰησοῦ Jesus/Joshua Χριστοῦ Christ καὶ and ἡμῶν I/we ἐπισυναγωγῆς gathering ἐπ᾽ upon/to/against αὐτὸν he/she/it/self
2
εἰς toward τὸ the/this/who μὴ not ταχέως quickly σαλευθῆναι shake ὑμᾶς you ἀπὸ away from τοῦ the/this/who νοὸς mind μηδὲ nor θροεῖσθαι, alarm μήτε neither διὰ through/beca… πνεύματος spirit/breath μήτε neither διὰ through/beca… λόγου word μήτε neither δι᾽ through/beca… ἐπιστολῆς epistle ὡς which/how δι᾽ through/beca… ἡμῶν, I/we ὡς which/how ὅτι that/since ἐνέστηκεν be present ἡ the/this/who ἡμέρα day τοῦ the/this/who κυρίου. lord
3
μή not τις one ὑμᾶς you ἐξαπατήσῃ deceive κατὰ according to μηδένα nothing τρόπον· way ὅτι that/since ἐὰν if μὴ not ἔλθῃ come/go ἡ the/this/who ἀποστασία apostasy πρῶτον first καὶ and ἀποκαλυφθῇ reveal ὁ the/this/who ἄνθρωπος human τῆς the/this/who ἀνομίας, lawlessness ὁ the/this/who υἱὸς son τῆς the/this/who ἀπωλείας, destruction
4
ὁ the/this/who ἀντικείμενος be an opponent καὶ and ὑπεραιρόμενος be haughty ἐπὶ upon/to/against πάντα all λεγόμενον speak θεὸν God ἢ or/than σέβασμα object of wo… ὥστε so αὐτὸν he/she/it/self εἰς toward τὸν the/this/who ναὸν temple τοῦ the/this/who θεοῦ God ὡς which/how θεὸν God καθίσαι seat ἀποδεικνύντα display ἑαυτὸν my/your/him-… ὅτι that/since