2 Corinthians 3:15

Overview - 2 Corinthians 3
Lest their false teachers should charge him with vain glory, he shows the faith and graces of the Corinthians to be a sufficient commendation of his ministry.
Whereupon entering a comparison between the ministers of the law and of the gospel,
12 he proves that his ministry is so far the more excellent, as the gospel of life and liberty is more glorious than the law of condemnation.
Treasury of Scripture Knowledge

2 Corinthians 3:15  (King James Version)
But even unto this day, when Moses is read, the vail is upon their heart.

the vail
Acts 13:27-29