The Great Feast of the Transfiguration + August 6

Verily, Christ took Peter, James and John to a high mountain apart. And He was transfigured before them, His countenance shining as the sun, and His clothes became white as light. Moses and Elijah appeared and conversed with Him, and a bright cloud covered them. Then behold, a voice from the cloud said, This is My beloved Son in Whom I am well-pleased; hear Him.

http://www.antiochian.org/transfiguration