Al-Sha'bi narrates that Sayyiduna Jabir (may Allah be pleased with him) said: I came to the Prophet (peace and blessings be upon him) with my father, and the Messenger of Allah (peace and blessings be upon him) said: "The affair of this Ummah will always remain upright until there have been twelve caliphs." Then he (peace and blessings be upon him) said something in a low voice, so I asked my father: What did he (peace and blessings be upon him) say? He said: "All of them will be from Quraysh."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 1785