10. ὅτανἔλθῃκτλ.] ‘ whenever He has (or, shall have) come …,’ the aor. subj. with ὅταν describing a completed action ‘ future by virtue of its mood, punctiliar by its tense’ (Moulton Prolegg. p. 186).
Ἐνδοξασθῆναι is found elsewhere in the N.T. only in v. 12, but is common in the LXX., cf. Exodus 14:4 ἐνδοξασθήσομαιἐνΦαραώ, and especially Psalms 88. (89.) 8 ὁθεὸςἐνδοξαζόμενοςἐνβουλῇἁγίων, a verse which may have suggested its use in the present passage.
ἐντ. ἁγίοις] In accordance with the context these words can refer here only to redeemed men (cf. I. 3:13 note), the preposition marking them out not as the agents of the Lord’ s glorification (Chrys.: ἐν, διά, ἐστί), but as the sphere or element in which this glorification takes place; cf. John 17:10 δεδόξασμαιἐναὐτοῖς.
καὶθαυμασθῆναικτλ.] parallel to the preceding clause and with the same wide sweep, cf. Psalms 67. (68.) 36 θαυμαστὸςὁθεὸςἐντοῖςὁσίοιςαὐτου. Bengel’ s proposal to limit τ. ἁγίοις to converted Jews and πᾶσιντ. πιστεύσασιν to converted Gentiles is quite untenable.
For ὁπιστεύσας as an almost technical title for ‘ one who has accepted the Gospel,’ ‘ a believer,’ cf. Acts 4:32; Acts 11:17.
ὅτιἐπιστεύθηκτλ.] a parenthetical clause catching up the preceding τ. πιστεύσασιν, and expressing the writers’ conviction that in the Thessalonians’ case the testimony addressed to them had secured the desired result.
While however the general sense is clear, the construction of this clause is admittedly difficult. The words ἐφʼ ὑμᾶς are usually connected directly with τὸμαρτύριονἡμ., as the order of the sentence naturally suggests, but no other instance of μαρτύριον with ἐπί in this sense is forthcoming and Findlay’ s idea of a ‘ testimony accosting (assailing, challenging) you’ for which he compares 1 Timothy 1:18, Ephesians 2:7, Revelation 14:6 is, to say the least, somewhat far-fetched. We must be content therefore either to regard this as a unique construction, intended to emphasize the direction the testimony took, or (with Lft.) connect ἐφʼ ὑμᾶς with ἐπιστεύθη in the sense ‘ belief in our testimony directed itself to reach you.’ WH.2 (Notes p. 128) favour this latter connexion, but despairing of then finding a proper meaning for ἐπιστεύθη propose the conjectural emendation ἐπιστώθη (read in cod. min. 31) ‘ was confirmed’ : ‘ the Christian testimony of suffering for the faith had been confirmed and sealed upon the Thessalonians.’
ἐντῇἡμέρᾳἐκείνῃ] a predicate of time connected with θαυμασθῆναι and rendered emphatic by position. For ἡἡμ. ἐκείνη as denoting the day of Christ’ s final coming cf. Mark 13:32; Mark 14:25, Luke 21:34, 2 Timothy 1:12; 2 Timothy 1:18; 2 Timothy 4:8, and for the general meaning of the phrase see note on I. 5:2.