Hadith 2563
Shu’bah said: I asked Mu’awiyah bin Qurrah: Did Sayyiduna Anas (may Allah be pleased with him) narrate that the Messenger of Allah (peace and blessings be upon him) said regarding Nu’man bin Muqarrin: “The sister’s son of a people is one of the people themselves”? He said: Yes.
Hadith 2564
Kathir bin Abdullah narrated from his father, who narrated from his grandfather, that the Messenger of Allah (peace be upon him) said: "The mawla of a people is from among them, and the ally of a people is from among them, and the sister's son is from among them."