Judgments (Ahkaam) 
Bukhari :: Book 9 :: Volume 89 :: Hadith 254
Narrated Ibn 'Umar:
Allah's Apostle said, "This matter (caliphate) will remain with the Quraish even if only two of them were still existing."
Judgments (Ahkaam)
Bukhari :: Book 9 :: Volume 89 :: Hadith 254
Narrated Ibn 'Umar:
Allah's Apostle said, "This matter (caliphate) will remain with the Quraish even if only two of them were still existing."