Sahih Muslim 4704
صحيح مسلم#4704SahihIt 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)
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 33:4