Luke 9:29-31

Amplified Bible

²⁹ As He was praying, the appearance of His face became different [actually transformed], and His clothing became white and flashing with the brilliance of lightning. ³⁰ And behold, two men were talking with Him; and they were Moses and Elijah, ³¹ who appeared in glory, and were speaking of His departure [from earthly life], which He was about to bring to fulfillment at Jerusalem.