Musannaf Ibn Abi Shaybah

Hazrat Rifa’ah narrates that the Messenger of Allah, peace and blessings be upon him, gathered the tribe of Quraysh and asked: “Is there any outsider among you?” The people replied: “No, except for our nephews, our allies, and our slaves.” The Prophet, peace and blessings be upon him, said: “Your nephews are from among you, your allies are from among you, and your slaves are also from among you.”