Sahih Muslim 1818
Sahih Muslim · Book 33: The Book on Government · The people follow the Quraish and the Caliphate belongs to the Quraish
It has been narrated on the authority of Hammam b. Munabbih who said:
وَحَدَّثَنَا مُحَمَّدُ بْنُ رَافِعٍ ، حَدَّثَنَا عَبْدُ الرَّزَّاقِ ، حَدَّثَنَا مَعْمَرٌ ، عَنْ هَمَّامِ بْنِ مُنَبِّهٍ ، قَالَ هَذَا مَا حَدَّثَنَا أَبُو هُرَيْرَةَ ، عَنْ رَسُولِ اللَّهِ صلى الله عليه وسلم فَذَكَرَ أَحَادِيثَ مِنْهَا وَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " النَّاسُ تَبَعٌ لِقُرَيْشٍ فِي هَذَا الشَّأْنِ مُسْلِمُهُمْ تَبَعٌ لِمُسْلِمِهِمْ وَكَافِرُهُمْ تَبَعٌ لِكَافِرِهِمْ " .
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.