Luke 9:31 YLT

²⁹  and it came to pass, in his praying, the appearance of his face became altered, and his garment white -- sparkling.

³⁰  And lo, two men were speaking together with him, who were Moses and Elijah,

³¹  who having appeared in glory, spake of his outgoing that he was about to fulfil in Jerusalem,

³²  but Peter and those with him were heavy with sleep, and having waked, they saw his glory, and the two men standing with him.

³³  And it came to pass, in their parting from him, Peter said unto Jesus, 'Master, it is good to us to be here; and we may make three booths, one for thee, and one for Moses, and one for Elijah,' not knowing what he saith: