Abd al-Malik bin Umayr narrates from Sayyiduna Jabir (may Allah be pleased with him) that he said: The Messenger of Allah (peace and blessings be upon him) said: "After me there will be twelve leaders (amirs)." Then he (peace and blessings be upon him) said something I could not understand, so I asked my father: "What did the Messenger of Allah (peace and blessings be upon him) say?" He said: "All of them will be from Quraysh."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 1862