Abu Dawud Book 31, Hadith Number 4266.

Chapter : Yellow dye.

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.