::Bless sins for the fifth time, Ibn Ishaq does not say that Al-Rabi killed Mahmud. In fact, it is Marhab who is said to have killed him by throwing a millstone upon him during the siege of Na'im, and ibn Ishaq shows Muhammad b. Maslama accepting Marhab’s challenge to single combat in order to avenge his brother! I don’t know what to make of the fact that you keep tying to add this falsehood.