"What did the third civil strife exhaust all the strength of the people for, according to the hadith narrated by the Prophet Muhammad (peace be upon him)?”
      Narrated Said bin Al-Musaiyab:                          When the first civil strife (in Islam)      took place because of the murder of 'Uthman, it left none of the Badr      warriors alive. When the second civil strife, that is the battle of      Al-Harra, took place, it left none of the Hudaibiya treaty companions      alive. Then the third civil strife took place and it did not subside      till it had exhausted all the strength of the people.