At Tawbah Ayah 80

ٱسْتَغْفِرْ لَهُمْ أَوْ لَا تَسْتَغْفِرْ لَهُمْ إِن تَسْتَغْفِرْ لَهُمْ سَبْعِينَ مَرَّةً فَلَن يَغْفِرَ ٱللَّهُ لَهُمْ‌ۚ ذَٲلِكَ بِأَنَّهُمْ كَفَرُواْ بِٱللَّهِ وَرَسُولِهِۦ‌ۗ وَٱللَّهُ لَا يَهْدِى ٱلْقَوْمَ ٱلْفَـٰسِقِينَ ٨٠ ?It does not matter? whether you ?O Prophet? pray for them to be forgiven or not. Even if you pray for their forgiveness seventy times, Allah will never forgive them. That is because they have lost faith in Allah and His Messenger. And Allah does not guide the rebellious people.