﴿ يَوْمَ تَبْيَضُّ وُجُوهٌۭ وَتَسْوَدُّ وُجُوهٌۭ ۚ فَأَمَّا ٱلَّذِينَ ٱسْوَدَّتْ وُجُوهُهُمْ أَكَفَرْتُم بَعْدَ إِيمَٰنِكُمْ فَذُوقُوا۟ ٱلْعَذَابَ بِمَا كُنتُمْ تَكْفُرُونَ ﴾

“on the Day [of Judgment] when some faces will shine [with happiness] and some faces will be dark [with grief]. And as for those with faces darkened, [they shall be told:] "Did you deny the truth after having attained to faith? Taste, then, this suffering for having denied the truth!"”

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 chastisement for what you disbelieved!’