Ubaydullah narrates from Sayyiduna Jabir bin Samurah (may Allah be pleased with him); he said: I went with my father to the Messenger of Allah (peace and blessings be upon him), and we sat with him (peace and blessings be upon him), and he (peace and blessings be upon him) said: "Islam will remain dominant until there have been twelve leaders or caliphs, all of them from Quraysh."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 1828