A.T. Robertson Commentary 1 Corinthians 1:8

"who shall also confirm you unto the end, [that ye be] unreproveable in the day of our Lord Jesus Christ." — 1 Corinthians 1:8 (ASV)

Shall confirm (βεβαιωσε). Direct reference to the same word in verse 6. The relative ος (who) points to Christ.

Unto the end (εως τελους). End of the age till Jesus comes, final preservation of the saints.

That ye be unreproveable (ανεγκλητους). Alpha privative and εγκαλεω, to accuse, old verbal, only in Paul in N.T. Proleptic adjective in the predicate accusative agreeing with υμας (you) without ωστε and the infinitive as in 1 Thessalonians 3:13; 5:23; Php 3:21. "Unimpeachable, for none will have the right to impeach" (Robertson and Plummer) as Paul shows in Ro 8:33; Colossians 1:22,28.