Surah Ali 'Imran 3:106

يَوْمَ تَبْيَضُّ وُجُوهٌ وَتَسْوَدُّ وُجُوهٌ ۚ فَأَمَّا ٱلَّذِينَ ٱسْوَدَّتْ وُجُوهُهُمْ أَكَفَرْتُم بَعْدَ إِيمَـٰنِكُمْ فَذُوقُوا۟ ٱلْعَذَابَ بِمَا كُنتُمْ تَكْفُرُونَ

On the Day [some] faces will turn white and [some] faces will turn black. As for those whose faces turn black, [to them it will be said], "Did you disbelieve [i.e., reject faith] after your belief? Then taste the punishment for what you used to reject."

Translation: Saheeh International

Tafsir

The day when some faces are blackened and some faces whitened that is the Day of Resurrection. As for those whose faces are blackened these being the disbelievers who are thrown into the Fire and to whom it is said in rebuke ‘Did you disbelieve after you had believed on the day the covenant was made? Then taste the …

Excerpt from Tafsir al-Jalalayn, commentary on 3:106, via Quran.com. The reader has the full commentary and 9 more tafsirs.