Surah Al-A'raf 7:108

وَنَزَعَ يَدَهُۥ فَإِذَا هِىَ بَيْضَآءُ لِلنَّـٰظِرِينَ

And he drew out his hand; thereupon it was white [with radiance] for the observers.

Translation: Saheeh International

Tafsir

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.

Excerpt from Tafsir al-Jalalayn, commentary on 7:108, via Quran.com. The reader has the full commentary and 9 more tafsirs.