7.الْأَعْرَاف

وَّنَزَعَ يَدَهٗ فَاِذَا هِىَ بَيۡضَآءُ لِلنّٰظِرِيۡنَ‏

And he drew out his hand (after putting it into his collar opening) and that (too) at once became (radiant) white to the viewers.