It is narrated from Sayyiduna Jabir bin Samurah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "My Ummah will continue to prevail upon the truth until there are twelve amirs over them, all of them from Quraysh."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 2048