Sayyiduna Jabir bin Samurah (may Allah be pleased with him) said: I heard the Messenger of Allah (peace and blessings be upon him) say: "After me, twelve leaders (amirs) will come to power." Then he (peace and blessings be upon him) said something that I did not hear, so I asked the people and also asked my father what he (peace and blessings be upon him) had said, for he was closer to him than I was. He told me: He (peace and blessings be upon him) said: "All of them will be from Quraysh."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 2054