Sahih Muslim · Hadith 4812

حدثنا هداب بن خالد الأزدي، حدثنا حماد بن سلمة، عن سماك بن حرب، قال سمعت جابر بن سمرة، يقول سمعت رسول الله صلى الله عليه وسلم يقول ‏"‏ لا يزال الإسلام عزيزا إلى اثنى عشر خليفة ‏"‏ ‏.‏ ثم قال كلمة لم أفهمها فقلت لأبي ما قال فقال ‏"‏ كلهم من قريش ‏"‏ ‏.‏

It has been narrated on the authority of Jabir b. Samura who said: I heard the Messenger of Allah (may peace be upon him) say: Islam will continue to be triumphant until there have been twelve Caliphs. Then the Holy Prophet (may peace be upon him) said something which I could not understand. I asked my father: What did he say? He said: He has said that all of them (twelve Caliphs) will be from the Quraish.

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).