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 there will be twelve amirs." Then he (peace and blessings be upon him) said something that I did not hear, so I asked my father what he (peace and blessings be upon him) had said. He told me that he (peace and blessings be upon him) had said: "All of them will be from Quraysh."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 2050