Quran 3:106

يَوۡمَ تَبۡيَضُّ وُجُوهٌ۬ وَتَسۡوَدُّ وُجُوهٌ۬‌ۚ فَأَمَّا ٱلَّذِينَ ٱسۡوَدَّتۡ وُجُوهُهُمۡ أَكَفَرۡتُم بَعۡدَ إِيمَـٰنِكُمۡ فَذُوقُواْ ٱلۡعَذَابَ بِمَا كُنتُمۡ تَكۡفُرُونَ ١٠٦

The day will come when some faces will be brightened (with joy), while other faces will be darkened (with misery). As for those whose faces are darkened, they will be asked, "Did you not disbelieve after believing? Therefore, suffer the retribution for your disbelief."