Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) says: I heard Sayyiduna Umar bin Khattab (may Allah be pleased with him) saying that when Abdullah bin Ubayy (the hypocrite) died, the Messenger of Allah (peace and blessings of Allah be upon him) was called for his funeral prayer. The Prophet (peace and blessings of Allah be upon him) went, and when he stood up with the intention of praying, I turned and stood in front of him and said: O Messenger of Allah! Are you going to pray the funeral prayer for the enemy of Allah, Abdullah bin Ubayy, who said such and such on such and such a day? I even counted those days. The Prophet (peace and blessings of Allah be upon him) smiled in response. When I insisted a lot, the Prophet (peace and blessings of Allah be upon him) said: "Umar! Step back. I have been given a choice and I have accepted (that choice). It has been said to me (by Allah): «اسْتَغْفِرْ لَهُمْ أَوْ لَا تَسْتَغْفِرْ لَهُمْ إِنْ تَسْتَغْفِرْ لَهُمْ سَبْعِينَ مَرَّةً فَلَنْ يَغْفِرَ اللَّـهُ لَهُمْ» (9-At-Tawbah:80) 'O Muhammad! Whether you ask forgiveness for them or do not ask forgiveness for them, even if you ask forgiveness for them seventy times, Allah will never forgive them.' If I knew that asking forgiveness more than seventy times would grant him forgiveness, I would have done so more times." Then the Prophet (peace and blessings of Allah be upon him) led the prayer, walked with the body, and stood by his grave until he finished. I was greatly astonished at my daring before the Messenger of Allah (peace and blessings of Allah be upon him); Allah and His Messenger know best. By Allah! Shortly after, these two verses were revealed: «وَلَا تُصَلِّ عَلَى أَحَدٍ مِنْهُمْ مَاتَ أَبَدًا وَلَا تَقُمْ عَلَى قَبْرِهِ إِنَّهُمْ كَفَرُوا بِاللَّـهِ وَرَسُولِهِ وَمَاتُوا وَهُمْ فَاسِقُونَ» (9-At-Tawbah:84) "O Muhammad! Never pray the funeral prayer for any of them (the hypocrites) who dies, nor stand by his grave. Surely, they disbelieved in Allah and His Messenger and died while they were defiantly disobedient." (After the revelation of these verses) the Prophet (peace and blessings of Allah be upon him) never prayed the funeral prayer for any hypocrite nor stood by his grave, until he passed away.