Sayyiduna Jabir bin Samurah (may Allah be pleased with him) said: I was with my father while the Messenger of Allah (peace and blessings be upon him) was delivering a sermon, and he (peace and blessings be upon him) said: "You will continue to be in good as long as twelve amirs are in charge over you." I asked my father: "Did I just hear the Messenger of Allah (peace and blessings be upon him) say that?" My father said: "He (peace and blessings be upon him) said: 'All of them will be from Quraysh.'"
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 2047