The Prophet ﷺ said, "The tribe of Quraish has precedence over the people in this connection (i.e the right of ruling). The Muslims follow the Muslims amongst them, and the infidels follow the infidels amongst them. People are of different natures: The best amongst them in the pre-lslamic period are the best in Islam provided they comprehend the religious knowledge. You will find that the best amongst the people in this respect (i.e. of ruling) is he who hates it (i.e. the idea of ruling) most, till he is given the pledge of allegiance."  

أَنَّ النَّبِيَّ ﷺ قَالَ النَّاسُ تَبَعٌ لِقُرَيْشٍ فِي هَذَا الشَّأْنِ مُسْلِمُهُمْ تَبَعٌ لِمُسْلِمِهِمْ وَكَافِرُهُمْ تَبَعٌ لِكَافِرِهِمْ وَالنَّاسُ مَعَادِنُ خِيَارُهُمْ فِي الْجَاهِلِيَّةِ خِيَارُهُمْ فِي الإِسْلاَمِ إِذَا فَقِهُوا تَجِدُونَ مِنْ خَيْرِ النَّاسِ أَشَدَّ النَّاسِ كَرَاهِيَةً لِهَذَا الشَّأْنِ حَتَّى يَقَعَ فِيهِ  

The Prophet ﷺ said, "Authority of ruling will remain with Quraish, even if only two of them remained."  

عَنِ النَّبِيِّ ﷺ قَالَ لا يَزَالُ هَذَا الأَمْرُ فِي قُرَيْشٍ مَا بَقِيَ مِنْهُمُ اثْنَانِ  

I heard the Prophet ﷺ saying, "There will be twelve Muslim rulers (who will rule all the Islamic world)." He then said a sentence which I did not hear. My father said, "All of them (those rulers) will be from Quraish."  

سَمِعْتُ النَّبِيَّ ﷺ يَقُولُ يَكُونُ اثْنَا عَشَرَ أَمِيرًا فَقَالَ كَلِمَةً لَمْ أَسْمَعْهَا فَقَالَ أَبِي إِنَّهُ قَالَ كُلُّهُمْ مِنْ قُرَيْشٍ