وَلاَ تُصَلِّ عَلَى أَحَدٍ مِّنْهُم مَّاتَ أَبَدًا وَلاَ تَقُمْ عَلَىَ قَبْرِهِ إِنَّهُمْ كَفَرُواْ بِاللّهِ وَرَسُولِهِ وَمَاتُواْ وَهُمْ فَاسِقُونَ
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سورة التوبة
(9/84) Never offer prayer for any of them who dies, and do not stand by his grave. Because they disbelieved in Allah and His Messenger, and died while they were Fâsiqûn (they were not in the Way of Allah).
Surah At-Tawbah