Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:4728a –
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السيوطي:٤٧٢٨a –

"إِنَّ اللهَ تَعَالى أَيَّدنِى بِأَشَدِّ الْعَرَب أَلْسُنًا، وَأَذْرُعًا بِابْنَى قَيلَةَ: الأَوسِ والْخَزْرجِ".  

[طب] الطبرانى في الكبير عن ابن عباس

See similar narrations below:

Collected by Ṭabarānī
tabarani:12014 – Muḥammad b. ʿAbdullāh al-Qirmiṭī al-ʿAdawī > Muḥammad b. ʿAbd al-ʿAzīz al-Māwardī > Ziyād b. Sahl > Bishr b. ʿAlī > ʿIkrimah > Ibn ʿAbbās

[Machine] The Messenger of Allah ﷺ said, "Indeed, Allah supported me with the toughest of the Arab tongues and the bravest of arms, the Banu Qayla tribe and the Khazraj tribe."  

الطبراني:١٢٠١٤ – حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللهِ الْقِرْمِطِيُّ الْعَدَوِيُّ ثنا مُحَمَّدُ بْنُ عَبْدِ الْعَزِيزِ الْماوَرْدِيُّ ثنا زِيَادُ بْنُ سَهْلٍ حَدَّثَنِي بِشْرُ بْنُ عَلِيٍّ عَنْ عِكْرِمَةَ عَنِ ابْنِ عَبَّاسٍ ؓ قَالَ

قَالَ رَسُولُ اللهِ ﷺ «إِنَّ اللهَ ﷻ أَيَّدَني بِأَشَدِّ الْعَرَبِ أَلْسُنًا وأَذْرُعًا بَنِي قَيْلَةَ الْأَوْسِ وَالْخَزْرَجِ»