کتاب الفتن · نُعیم بن حماد

It has been narrated on the authority of Jabir b. Samura that the Prophet (ﷺ) said:This order will continue to be dominant until there have been twelve Caliphs. The narrator says: Then he said something which I could not understand, and I said to my father: What did he say? My father told me that he said that all of them (Caliphs) would be from the Quraish