‏الزكاة : Hadeeth No:2326 Abu Sa'id al-Khudri reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: There would be two groups in my Ummah, and there would emerge another group (seceding itself from both of them), and the party nearer to the truth among the two would kill them (the group of the Khwarij)....

‏البيوع : Hadeeth No:3631 Jabir (Allaah be pleased with him) reported a similar hadith from Allaah's Prophet (sallAllaahu alayhi wa sallam) through another chain of transmitters....