The people follow the Quraish and the Caliphate belongs to the Quraish
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا جَرِيرٌ، عَنْ حُصَيْنٍ، عَنْ جَابِرِ بْنِ سَمُرَةَ، قَالَ سَمِعْتُ النَّبِيَّ صلى الله عليه وسلم يَقُولُ ح وَحَدَّثَنَا رِفَاعَةُ بْنُ الْهَيْثَمِ الْوَاسِطِيُّ، - وَاللَّفْظُ لَهُ - حَدَّثَنَا خَالِدٌ، - يَعْنِي ابْنَ عَبْدِ اللَّهِ الطَّحَّانَ - عَنْ حُصَيْنٍ، عَنْ جَابِرِ بْنِ سَمُرَةَ، قَالَ دَخَلْتُ مَعَ أَبِي عَلَى النَّبِيِّ صلى الله عليه وسلم فَسَمِعْتُهُ يَقُولُ " إِنَّ هَذَا الأَمْرَ لاَ يَنْقَضِي حَتَّى يَمْضِيَ فِيهِمُ اثْنَا عَشَرَ خَلِيفَةً " . قَالَ ثُمَّ تَكَلَّمَ بِكَلاَمٍ خَفِيَ عَلَىَّ - قَالَ - فَقُلْتُ لأَبِي مَا قَالَ قَالَ " كُلُّهُمْ مِنْ قُرَيْشٍ " .
It has been narrated on the authority of Jabir b. Samura who said: 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.