It is narrated from Sayyiduna Sa'd (may Allah be pleased with him) that when Banu Najiyah were mentioned before the Messenger of Allah (peace and blessings be upon him), he said, "I am from them and they are from me."
Hadith Referenceمسند احمد / مسند باقي العشرة المبشرين بالجنة / 1447
Hadith Gradingحکم دارالسلام:إسناده ضعيف لجهالة ابن اخي سعد، ولاضطراب سنده