And as he prayed, the fashion of his countenance was altered,.... It became exceeding bright and glorious, it shone like the sun, Mt 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 "Mt 17:2".