Translation for 21:39

لَوۡ يَعۡلَمُ ٱلَّذِينَ كَفَرُواْ حِينَ لَا يَكُفُّونَ عَن وُجُوهِهِمُ ٱلنَّارَ وَلَا عَن ظُهُورِهِمۡ وَلَا هُمۡ يُنصَرُونَ ٣٩
If only the disbelievers knew that a time will come when they will not be able to keep the Fire off their faces or backs, nor will they be helped.