A.T. Robertson Commentary Hebrews 10:14

"For by one offering he hath perfected for ever them that are sanctified." — Hebrews 10:14 (ASV)

He hath perfected (τετελειωκεν). Perfect active indicative of τελειοω. He has done what the old sacrifices failed to do (verse 1).

Them that are sanctified (τους αγιαζομενους). Articular participle (accusative case) present passive of αγιαζω (note perfect in verse 10) either because of the process still going on or because of the repetition in so many persons as in 2:11.