Surah 7. Al-A'raf, Ayah 108

As is evident from 20:22 , 27:12 and 28:32 , the hand of Moses was "[shining] white without blemish", i.e., endowed with transcendent luminosity in token of his prophethood - and not, as stated in the Bible (Exodus iv, 6), "leprous as snow". Regarding the possible mystic significance of the miracle of the staff, see note [14] on 20:21 .

But the second Sign displayed by Moses was even more puzzling to the Egyptians. Moses drew out his hand from the folds of the garments on his breast, and it was white and shining as with divine light! This was to counter any suggestions of evil, which the serpent might have created. This was no work of evil, of black magic, or a trick or illusion. His hand was transfigured with a light which no Egyptian sorcerers could produce. In Islamic literature the "white hand" of Moses has passed into a proverb, for a symbol of divine glory dazzling to the beholders.