Musnad Abu Ya'la al-Mawsili 41:11

Musa ibn Hayyan narrated to us, Muhammad ibn Ja'far narrated to us, from Shu'bah, who said: I asked Sa'd ibn Ibrahim about the Banu Najiya. He said: "They are from us." Sa'd said: "They narrate from Sa'id ibn Zayd, from the Prophet, peace and blessings of Allah be upon him, that he said: 'They are a clan from me.'" Shu'bah said: "And I think he said: 'And I am from them.'"