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“After six days Jesus took Peter, James and John with him and led them up a high mountain, where they were all alone. There he was transfigured before them. His clothes became dazzling white, whiter than anyone in the world could bleach them. And there appeared before them Elijah and Moses, who were talking with Jesus.” (St. Mark 9.2-4)
When Moses and Elijah were with Jesus during His transfiguration on Mount Tabor, they had, in a very real sense, already been transfigured – Moses on Mount Sinai and Elijah in the fiery chariot. Nor were they alone in the changing of their appearances.