Al-Sha'bi narrates that Sayyiduna Jabir bin Samurah al-Suwa'i (may Allah be pleased with him) said: I came to the mosque with my father while the Prophet (peace and blessings be upon him) was delivering a sermon, and I heard him (peace and blessings be upon him) say: "After me there will be twelve caliphs." Then he (peace and blessings be upon him) lowered his voice, so I did not know what he (peace and blessings be upon him) was saying. I asked my father: What is he (peace and blessings be upon him) saying? He said: "All of them will be from Quraysh."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 1786