Luke 9:29

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

Luke 9:29 Meaning and Commentary

Luke 9:29

And as he prayed, the fashion of his countenance was altered,
&c.] It became exceeding bright and glorious, it shone like the sun, ( Matthew 17:2 ) and hereby his prayer was answered; and thus, as Christ was heard and answered, whilst he was yet speaking, so are his people sometimes; and even their countenance is altered, when they are favoured with communion with God, and instead of a sad and dejected countenance, they have a cheerful one. And his raiment was white and glistering;
it was as white as the light, as snow, and whiter than any fuller on earth could whiten, as the other evangelists say, and so glistened exceedingly; (See Gill on Matthew 17:2). (See Gill on Mark 9:3).

Luke 9:29 In-Context

27 and I say to you, truly, there are certain of those here standing, who shall not taste of death till they may see the reign of God.'
28 And it came to pass, after these words, as it were eight days, that having taken Peter, and John, and James, he went up to the mountain to pray,
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,
Young's Literal Translation is in the public domain.