Abu Dawud said: Abu Ishaq told that Ali looked at his son al-Hasan and said: This son of mine is a sayyid (chief) as named by the Prophet ﷺ, and from his loins will come forth a man who will be called by the name of your Prophet ﷺ and resemble him in conduct but not in appearance. He then mentioned the story about his filling the earth with justice.
Hadith Referenceسنن ابي داود / كتاب المهدى / 4290
Hadith Gradingالألبانی:ضعيف | زبیر علی زئی:ضعيف, إسناده ضعيف, أبو داود لم يدرك ھارون،فالأول منقطع و أبوإسحاق عنعن ولم يسمعه من علي رضي اللّٰه عنه،والثاني فيه أبو الحسن الكوفي وھلال بن عمرو مجهولان (تقريب التهذيب: 8051،7345), انوار الصحيفه، صفحه نمبر 152
Narrated Ali ibn Abu Talib: The Prophet ﷺ said: A man called al-Harith ibn Harrath will come forth from Ma Wara an-Nahr. His army will be led by a man called Mansur who will establish or consolidate things for Muhammad's family as Quraysh consolidated them for the Messenger of Allah ﷺ. Every believer must help him, or he said: respond to his sermons.
The tradition mentioned above has also been transmitted by Simak through a different chain of narrators to the same effect.
Hadith Referenceسنن ابي داود / كتاب السنة / 4724
Hadith Gradingزبیر علی زئی:ضعيف, إسناده ضعيف, ترمذي (3320) ابن ماجه (193), سماك بن حرب اختلط كما تقدم بالإشارة (2238) ولا نعرف تحديثه به قبل اختلاطه و عبد اللّٰه بن عميرة لا يعرف له سماع من الأحنف كما قال البخاري رحمه اﷲ (التاريخ الكبير 159/5), انوار الصحيفه، صفحه نمبر 165
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