The apse mosaic of the Transfiguration scene from St. Catherine monastery in Sinai.
This very well preserved composition of the Transfiguration, shows all its motives. Note the rays of light that emerge from Christ to the other figures. Reprinted from: George H. Forsyth and Kurt Weitzmann, The Monastery of Saint Catherine at Mount Sinai: The Church and Fortress of Justinian; plate CIII. Under a CC BY license, with permission from: The University of Michigan Press, Ann Arbor, 1973.