Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) narrates that the Prophet (peace and blessings be upon him) said: "Indeed, Allah Almighty has supported me through the two sons of Qaylah, who are the strongest of the Arabs in tongue and the strongest of them in arm: they are the people of the tribes of Aws and Khazraj."
Imam al-Tabarani recorded this narration, and its chain contains a group of narrators whom I do not know.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب المناقب / 16494
Hadith Gradingمحدثین:إسنادہ ضعیف
Hadith Takhrij«اخرجه الطبراني فى المعجم الكبير (12014) ، أخرجه المعجم الكبير للطبراني برقم: 12014»