Luke 9:31 WEB

²⁹  As he was praying, the appearance of his face was altered, and his clothing became white and dazzling.

³⁰  Behold, two men were talking with him, who were Moses and Elijah,

³¹  who appeared in glory, and spoke of his departure,{Literally, 'exodus'} which he was about to accomplish at Jerusalem.

³²  Now Peter and those who were with him were heavy with sleep, but when they were fully awake, they saw his glory, and the two men who stood with him.

³³  It happened, as they were parting from him, that Peter said to Jesus, 'Master, it is good for us to be here. Let's make three tents: one for you, and one for Moses, and one for Elijah,' not knowing what he said.