Abu Dawud
The Promised Deliverer
Book Number: 031 / Hadith Number: 4266
Narated By Jabir ibn Samurah : The Prophet (pbuh) said: The religion will continue to be established till there are twelve caliphs over you, and the whole community will agree on each of them. I then heard from the Prophet (pbuh) some remarks which I could not understand. I asked my father: What is he saying: He said: all of them will belong to Quraysh.