‏الإمارة : Hadeeth No:4476 It has been narrated on the authority of 'Abdullah that the Messenger of Allaah (sallAllaahu alayhi wa sallam) said: The Caliphate will remain among the Quraish even if only two persons are left (on the earth),...

‏الزكاة : Hadeeth No:2135 A hadith like this has been narrated by 'Amr b. Yahya with the same chain of transmitters....