Commentary Purg IX 81

Beginning with Scartazzini/Vandelli (DDP Vandelli.Purg.IX.79-84), commentators resort to the Bible (Matth. 28:3) for the stern brightness of the angelic countenance: 'Erat autem aspectus ejus sicut fulgur' (His countenance was as the lightning). This, of course, is the angel who descended to roll back the stone from the sepulcher in which the body of Jesus was entombed.