Vail or Veil of the Spiritual Blindness of the Jewish Nation
Source: TTT
2 Corinthians 3:14–16
But their minds were closed. For to this day the same veil remains at the reading of the old covenant. It has not been lifted, because only in Christ can it be removed. / And even to this day when Moses is read, a veil covers their hearts. / But whenever anyone turns to the Lord, the veil is taken away.