What did the Prophet Muhammad (peace be upon him) say about those who fight in Allah's Cause and are killed?
      Narrated Abu Huraira:                          Allah's Apostle said, "Allah welcomes two men with a smile; one of      whom kills the other and both of them enter Paradise. One fights in      Allah's Cause and gets killed. Later on Allah forgives the 'killer who     also get martyred (In Allah's Cause)."