Kitab al-Fitan · Nu'aym ibn Hammad

السابع من بني العباس يدعو الناس إلى الكفر فلا يجيبونه، فيقول له أهل بيته: تريد أن تخرجنا من معايشنا؟ فيقول: إني أسير فيكم بسيرة أبي بكر وعمر رضي الله عنهما، فيأبون عليه، فيقتله عدو له من أهل بيته من بني هاشم، فإذا وثب عليه اختلفوا فيما بينهم فذكر اختلافا طويلا إلى خروج السفياني

The seventh of the Abbasids calls people to disbelief, but they do not respond to him, so his family says to him: Do you want to expel us from our livelihood? So he says: I am following among you the path of Abu Bakr and Omar (may Allah be pleased with him), but they refuse him, and then an enemy of his from his family from Banu Hashim kills him. If he attacks him, they disagree among themselves, and he mentioned a long disagreement until the emergence of Al-Sufyani.

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Traced to Ka'b al-Ahbar (automatic guess): a report of earlier scriptures, not a hadith of the Prophet ﷺ.

إذا خلع من بني العباس رجلان وهما الفرعان وقع بينهما الاختلاف الأول، ثم يتبعه الاختلاف الآخر الذي فيه الفناء، وخروج السفياني عند اختلافهم الثاني

If two men from Banu Abbas were deposed, and they were the two branches, the first disagreement occurred between them, then the second disagreement followed, which involved annihilation, and the emergence of the Sufyani upon their second disagreement.

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