يَوْمَ تَبْيَضُّ وُجُوهٌ وَتَسْوَدُّ وُجُوهٌ

“On the Day when some faces will become white and some faces will become black” [Surah Al' Imran 3, Verse 106]

-

Tafsir Ibn Katheer

“on the Day of Resurrection. This is when the faces of followers of the Sunnah and the Jama`ah will radiate with whiteness, and the faces of followers of Bid`ah (innovation) and division will be darkened, as has been reported from Ibn `Abbas.“

-

http://www.tafsir.com/default.asp?sid=3&tid=8983