AL ANFAAL — Ayat 50
وَلَوْ تَرَى إِذْ يَتَوَفَّى الَّذِينَ كَفَرُواْ الْمَلآئِكَةُ يَضْرِبُونَ وُجُوهَهُمْ وَأَدْبَارَهُمْ وَذُوقُواْ عَذَابَ الْحَرِيقِ
And if you could but see when the angels take the souls of those who disbelieved... They are striking their faces and their backs and [saying], "Taste the punishment of the Burning Fire.
Tafsir Ibnu Katsir
وَلَوْ تَرَى إِذْ يَتَوَفَّى الَّذِينَ كَفَرُواْ الْمَلَـئِكَةُ يَضْرِبُونَ وُجُوهَهُمْ وَأَدْبَـرَهُمْ وَذُوقُواْ عَذَابَ الْحَرِيقِ ذلِكَ بِمَا قَدَّمَتْ أَيْدِيكُمْ وَأَنَّ اللَّهَ لَيْسَ بِظَلَّـمٍ لِّلْعَبِيدِ
50. And if you could see when the angels take away the souls of those who disbelieve (at death); they smite their faces and their backs, (saying): â€Taste the punishment of the blazing Fire. '' 51. â€This is because of that which your hands forwarded. And verily, Allah is not unjust to His servants.''  Allah says, if you witnessed the angels capturing the souls of the disbelievers, you would witness a tremendous, terrible, momentous and awful matter,