Sayyiduna Jabir bin Samurah (may Allah be pleased with him) said: I went with my father to the Messenger of Allah (peace and blessings be upon him), and he (peace and blessings be upon him) said: "This matter will not come to an end until twelve caliphs have passed." Then he (peace and blessings be upon him) said something that I could not understand, so I asked my father: What did he (peace and blessings be upon him) say? He told me: He (peace and blessings be upon him) said: "All of them will be from Quraysh."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 2055