Surah No. 8, Al Anfaal, Ayat No. 50
وَلَوْ تَرَى إِذْ يَتَوَفَّى الَّذِينَ كَفَرُواْ الْمَلآئِكَةُ يَضْرِبُونَ وُجُوهَهُمْ وَأَدْبَارَهُمْ وَذُوقُواْ عَذَابَ
o الْحَرِيقِ
Translation :
If you could see, when the angels take the souls of the Unbelievers (at their death), they smash their faces and their backs, saying : "Taste now the penalty of the Blazing Fire.