But if the ministry of death, written and engraved in stones, was glorious, so that the children of Israel could not steadfastly behold the face of Moses for the glory of his countenance; which glory was to be done away:
All Commentaries on 2 Corinthians 3:7 Go To 2 Corinthians 3
Tertullian of Carthage
AD 220
He alludes to Moses' veil, covered with which "his face could not be stedfastly seen by the children of Israel.".
Since he did this to maintain the superiority of the glory of the New Testament, which is permanent in its glory, over that of the Old, "which was to be done away"