Musannaf Ibn Abi Shaybah 34561 — Reports on the virtue of Quraysh

Sayyiduna Rifa'ah (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) gathered Quraysh and said: "Is there any outsider among you?" They said: "No, except for our sisters' sons, our slaves and our allies." He (peace and blessings be upon him) said: "Your sisters' sons are from among you, your allies are from among you, and your slaves are from among you. Indeed, Quraysh are truthful and trustworthy. Whoever looks for their mistakes and slips, Allah will throw him down on his face."