Hadith No: 1
Ibn Adi - al-Kamil fi Duafa al-Rijal - 1528: Ata ibn Muslim al-Khaffaf al-Halabi
Volume: (7) - Page Number: (80/81)
[The text is lengthy, so only the relevant excerpt is provided here]
- Muhammad ibn Yusuf al-Farabri narrated to us, Ali ibn Khashram narrated to us, and I heard Al-Fadl ibn Musa and Waki' both say about Ata ibn Muslim: "He is trustworthy": .... Abdaan and Al-Fadl ibn Abdullah ibn Makhlad narrated to us, al-Musayyib ibn Wadih narrated to us, Ata ibn Muslim narrated to me, Abu Amr al-Ashghee narrated to me from Salim ibn Abi al-Jad' about Qais ibn Abi Hazim from Hudhayfa, who said: "I stayed overnight with the Messenger of Allah (peace be upon him) and saw someone with him. He said to me, 'O Abu Hudhayfa, have you seen?' I replied, 'Yes, O Messenger of Allah.' He said, 'This is an angel who has not descended since I was sent. He came to me tonight to give me the good news that Hasan and Husayn are the leaders of the youth of the inhabitants of Paradise.' Ata said: "They told us he continued, 'And their father is better than them.'"

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Reference: Ù“Al-Kaamil fi Dho'afaa al-Rijaal Book 7

Hadith No: 2
Ibn Adi - al-Kamil fi Duafae al-Rijal - 1855: Ma'li ibn Abd al-Rahman al-Wasiti
Volume: (8) - Page Number: (102/103)
- Ibn Sa'id narrated to us, saying: Khallaf ibn Muhammad al-Wasiti narrated to us, saying: Ma'li ibn Abd al-Rahman al-Wasiti narrated to us, who said that Ibn Sa'id was praising al-Daqiqi. Abdullah ibn Ibrahim al-Qasri and Muhammad ibn Harun ibn Humayd both said: Al-Hasan ibn Ali al-Halwani narrated to us, saying: Ma'li ibn Abd al-Rahman narrated to us from Ibn Abi Dhihb from Nafi' from Ibn Umar, who said: The Messenger of Allah (peace be upon him and his holy progeny) said, "Al-Hasan and Al-Husayn are the leaders of the youth of the inhabitants of Paradise, and their father is better than them."

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Reference: Ù“Al-Kaamil fi Dho'afaa al-Rijaal Book 8

Hadith No: 3
Ibn Adi - al-Kamil fi Dha'afa' al-Rijal - 1865: Malik ibn al-Hasan ibn Malik ibn al-Huwairth
Volume: (8) - Page Number: (116/117)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... Ibn Urobah narrated to us, saying: Zakariya ibn al-Hakam and Yahya ibn al-Hasan al-Abli narrated to us, both said: Imran ibn Aban narrated to us from Malik ibn al-Hasan ibn Malik ibn al-Huwairth, from his father, from his grandfather, that the Prophet (peace be upon him and his holy progeny) said: "Al-Hasan and al-Husayn are the young leaders of the people of Paradise, and their father is better than them." These hadiths with this chain of narration from Malik ibn al-Hasan cannot be narrated by anyone except Imran ibn Aban al-Wasiti, and Imran ibn Aban is reliable. I believe that the issue lies with Malik ibn al-Hasan, as no one can corroborate this chain with this hadith.

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Reference: Ù“Al-Kaamil fi Dho'afaa al-Rijaal Book 8