From Sahih Muslim (Hadith 4706):
It has been reported on the authority of Jabir b. Samura who said:I heard the Messenger of Allah (ﷺ) say: The affairs of the people will continue to be conducted (well) as long as they are governed by twelve men. Then the Prophet (ﷺ) said words which were obscure to me. I asked my father: What did the Messenger of Allah (ﷺ) say? He said: All of the (twelve men) will be from the Quraish
Reference: Muslim 4706