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:6843a –
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السيوطي:٦٨٤٣a –

"إِنَّ لبنى العبَّاسِ رَايَتَيْنِ، أعْلاها كُفْرٌ، ومَرْكَزُها ضَلَالَةُ، فَإِن أدْركتَها فَلا تَضِلَّ".  

[طب] الطبرانى في الكبير عن ثوبان

See similar narrations below:

Collected by Ṭabarānī
tabarani:1424 – Aḥmad b. Muḥammad b. Yaḥyá b. Ḥamzah > Isḥāq b. Ibrāhīm Abū al-Naḍr > Yazīd b. Rabīʿah > Abū al-Ashʿath > Thawbān

[Machine] The Messenger of Allah ﷺ said, "Verily, the Al-Abbas clan has two banners, the highest of which is disbelief and its center is misguidance. So, if you come across it, do not go astray."  

الطبراني:١٤٢٤ – حَدَّثَنَا أَحْمَدُ بْنُ مُحَمَّدِ بْنِ يَحْيَى بْنِ حَمْزَةَ ثنا إِسْحَاقُ بْنُ إِبْرَاهِيمَ أَبُو النَّضْرِ ثنا يَزِيدُ بْنُ رَبِيعَةَ ثنا أَبُو الْأَشْعَثِ عَنْ ثَوْبَانَ قَالَ

قَالَ رَسُولُ اللهِ ﷺ «إِنَّ لِبَنِي الْعَبَّاسِ رَايَتَيْنِ أَعْلَاهَا كُفْرٌ وَمَرْكَزُها ضَلَالَةٌ فَإِنْ أَدْرَكْتَهَا فَلَا تَضِلَّ»