Luke 9:29

29 And as he was praying, the fashion of his countenance was altered, and his raiment [became] white [and] dazzling.

Luke 9:29 In-Context

27 But I tell you of a truth, There are some of them that stand here, who shall in no wise taste of death, till they see the kingdom of God.
28 And it came to pass about eight days after these sayings, that he took with him Peter and John and James, and went up into the mountain to pray.
29 And as he was praying, the fashion of his countenance was altered, and his raiment [became] white [and] dazzling.
30 And behold, there talked with him two men, who were Moses and Elijah;
31 who appeared in glory, and spake of his decease which he was about to accomplish at Jerusalem.
The American Standard Version is in the public domain.