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.
suyuti:4-527bBá Sḥāq > Qāl And Nẓar > Āb.ih al-Ḥasan
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السيوطي:٤-٥٢٧bعن أبى إسحاق قال

قَالَ وَنظَرَ إِلَى ابْنِه الحَسَن فَقَالَ: إنَّ ابْنِى هَذَا سيدٌ كَمَا سَماه النَّبى ﷺ سَيَخْرُجُ منْ صُلبِهِ رَجُل يُسَمى اسمَ نَبِيكُّمْ يُشْبِهُهُ في الخُلُقِ، وَلاَ يُشْبِهُهُ في الخَلقِ، يَمْلأُ الأرْضَ عَدْلا  

[د] أبو داود ونعيم بن حماد في الفتن

See similar narrations below:

Collected by Abū Dāwūd

The Mahdī will be from the bloodline of al-Ḥasan

abudawud:4290al-Mughīrah > ʿAmr b. Abū Qays > Shuʿayb b. Khālid > Abū Isḥāq

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.  

أبو داود:٤٢٩٠الْمُغِيرَةِ قَالَ حَدَّثَنَا عَمْرُو بْنُ أَبِي قَيْسٍ عَنْ شُعَيْبِ بْنِ خَالِدٍ عَنْ أَبِي إِسْحَاقَ قَالَ

قَالَ عَلِيٌّ ؓ وَنَظَرَ إِلَى ابْنِهِ الْحَسَنِ فَقَالَ إِنَّ ابْنِي هَذَا سَيِّدٌ كَمَا سَمَّاهُ النَّبِيُّ ﷺ وَسَيَخْرُجُ مِنْ صُلْبِهِ رَجُلٌ يُسَمَّى بِاسْمِ نَبِيِّكُمْ يُشْبِهُهُ فِي الْخُلُقِ وَلاَ يُشْبِهُهُ فِي الْخَلْقِ ثُمَّ ذَكَرَ قِصَّةَ يَمْلأُ الأَرْضَ عَدْلاً