Transfiguration is described by Luke (9:28-36): “(Jesus) took Peter and John and James, and went up into the mountain to pray. And as he prayed, the fashion of his countenance was altered, and his raiment was white and glistering.” The two men, prophets Moses and Elias, came to talk to Jesus, while his accompanying disciples were fast asleep, and “when they were awake, they, they saw his glory, and the two men that stood with him.” Peter suggests they erect three tabernacles, “one for thee, one for Moses, and one for Elias”. While he was speaking, a cloud overshadowed them and a voice said: “This is my beloved Son: hear him.”
See: Giovanni Bellini. Transfiguration. Transfiguration.
Duccio di Buoninsegna. Maestà: The Transfiguration of Christ.
Raphael The Transfiguration.
Theophanes the Greek. The Transfiguration.