﴿ وَنَزَعَ يَدَهُۥ فَإِذَا هِىَ بَيْضَآءُ لِلنَّٰظِرِينَ ﴾

“and he drew forth his hand, and lo! it appeared [shining] white to the beholders.”

And he drew forth his hand he took it out from his bosom and lo! it was white radiant for the beholders and not its usual skin colour.