Which statement of the Prophet Muhammad (saw) did Al-Ahnaf bin Qais hear while on his way to help 'Ali Ibn Abi Talib?
      Narrated Al-Ahnaf bin Qais:                          While I was going to help this man ('Ali Ibn Abi Talib), Abu Bakra met     me and asked, "Where are you going?" I replied, "I am going to help      that person." He said, "Go back for I have heard Allah's Apostle      saying, 'When two Muslims fight (meet) each other with their swords,      both the murderer as well as the murdered will go to the Hell-fire.' I     said, 'O Allah's Apostle! It is all right for the murderer but what      about the murdered one?' Allah's Apostle replied, "He surely had the      intention to kill his companion."