Sahih Muslim

People are subservient to the Quraish: the Muslims among them being subservient to the Muslims among them, and the disbelievers among the people being subservient to the disbelievers among them.

This is one of the traditions narrated by Abu Huraira from the Messenger of Allah (ﷺ) 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.

People are the followers of Quraish in good as well as evil (i.e. in the customs of Islamic as well as pre-Islamic times).

The Caliphate will remain among the Quraish even if only two persons are left (on the earth),

I joined the company of the Prophet (ﷺ) with my father and I heard him say: This Caliphate will not end until there have been twelve Caliphs among them. The narrator said: Then he (the Holy Prophet) said something that I could not follow. I said to my father: What did he say? He said: He has said: All of them will be from the Quraish.

I heard the Messenger of Allah (ﷺ) say: The affairs of the people will continue to be conducted (well) as long as they are governed by twelve men. Then the Prophet (ﷺ) said words which were obscure to me. I asked my father: What did the Messenger of Allah (ﷺ) say? He said: All of the (twelve men) will be from the Quraish.

This hadith has been narrated on the authority of Jabir b. Samura through another chain of transmitters.

I heard the Messenger of Allah (ﷺ) say: Islam will continue to be triumphant until there have been twelve Caliphs. Then the Prophet (ﷺ) said something which I could not understand. I asked my father: What did he say? He said: He has said that all of them (twelve Caliphs) will be from the Quraish.

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.