Sahih Muslim
The Book on Government (Kitab Al-Imara)
Book Number: 020 / Hadith Number: 4474
It has been narrated on the authority of Hammam b. Munabbih who said: This is one of the traditions narrated by Abu Huraira from the Messenger of Allah (may peace be upon him) who said: People are subservient to the Quraish: the Muslims among them being subservient to the Muslims among them, and the disbelievers among them being subservient to the disbelievers among them.