(1) باب النَّاسُ تَبَعٌ لِقُرَيْشٍ وَالْخِلاَفَةُ فِي قُرَيْشٍ
It has been narrated on the authority of 'Abdullah that the Messenger of Allah (ﷺ) said:
The Caliphate will remain among the Quraish even if only two persons are left (on the earth),
Reference: Sahih Muslim 1820
In-book reference: Book 33, Hadith 4
USC-MSA web (English) reference(deprecated numbering scheme): Book 20, Hadith 4476