A.T. Robertson Commentary 2 Corinthians 3:13

"and [are] not as Moses, [who] put a veil upon his face, that the children of Israel should not look stedfastly on the end of that which was passing away:" — 2 Corinthians 3:13 (ASV)

Put a veil upon his face (ετιθε καλυμμα επ το προσωπον αυτου). Imperfect active of τιθημ, used to put (Exodus 34:33).

That the children of Israel should not look steadfastly (προς το μη ατενισα τους υιους). Purpose expressed by προς and the articular infinitive with negative μη and the accusative of general reference. The Authorized Version had a wrong translation here as if to hide the glory on his face.