Abu Khalid said: I heard Sayyiduna Jabir bin Samurah (may Allah be pleased with him) say: The Messenger of Allah (peace and blessings be upon him) said: "This religion will not be harmed by those who oppose it until twelve caliphs have arisen, all of them from Quraysh."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 1839