اسْتَغْفِرْ لَهُمْ أَوْ لاَ تَسْتَغْفِرْ لَهُمْ إِن تَسْتَغْفِرْ لَهُمْ سَبْعِينَ مَرَّةً فَلَن يَغْفِرَ اللّهُ لَهُمْ ذَلِكَ بِأَنَّهُمْ كَفَرُواْ بِاللّهِ وَرَسُولِهِ وَاللّهُ لاَ يَهْدِي الْقَوْمَ الْفَاسِقِينَ
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سورة التوبة
(9/80) Ask thou forgiveness for them or ask thou not forgiveness for them: if thou askest forgiveness for them seventy times, Allah will forgive them not. This, because they disbelieved in Allah and His apostle, and Allah guideth not an ungodly people.
Surah At-Tawbah