مختصر صحيح مسلم
Mukhtasar Sahih Muslim
Book of Governance
The caliph should be from Quraysh.
Sayyiduna Abdullah bin Umar (may Allah be pleased with them) narrates that the Messenger of Allah (peace and blessings be upon him) said: This matter, that is, the caliphate, will always remain among the Quraysh until only two men remain in the world.
