Hadith No: 1
Al-Hakim al-Nisapouri - Al-Mustadrak ala al-Sahihayn
Book of Knowledge of the Companions (ra) - Al-Hasan and Al-Husayn, Masters of the Youths of the Paradise
Volume: (3) - Page Number: (167)
4832 - Abu Sa'id 'Amr ibn Muhammad ibn Mansur al-'Adl narrated to us, sating: al-Sari ibn Khuzaymah narrated to us, saying: Uthman ibn Sa'id al-Marri narrated to us, saying: Ali ibn Salih narrated to us, from Asim, from Zur, from Abdullah (ra) who said: The Messenger of Allah (peace be upon him and his holy progeny) said: "Al-Hasan and Al-Husayn are the Masters of the Youths of Paradise, and their father is better than them." This is a sahih (authentic) hadith with this addition, but they did not include it in their collections.

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Reference: Al-Mustadarak ala al-Saheehain Book 3

Hadith No: 2
Al-Hakim al-Nisapouri - Al-Mustadrak 'ala al-Sahihain
Book of the Knowledge of the Companions (ra) - Al-Hasan and Al-Husayn, Masters of the Youths of the Garden
Volume: (3) - Page Number: (167)
4833 - And what we were told was witnessed by: Abu al-Hasan Muhammad ibn Abdullah ibn Muhammad ibn Sabih al-Umari, who said: Muhammad ibn Ishaq ibn Khuzayma al-Imam narrated to me, saying: Muhammad ibn Musa al-Qattan narrated to me, saying: Ma'li ibn Abdul Rahman narrated to me, saying: Ibn Abi Ziyab narrated to me, from Nafi' from Ibn Umar (ra), who said: The Messenger of Allah (peace be upon him and his holy progeny) said, "Al-Hasan and Al-Husayn are the Masters of the Youths of the Garden, and their father is better than them."

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Reference: Al-Mustadarak ala al-Saheehain Book 3

Hadith No: 3
Al-Hakim al-Nisaburi - Al-Mustadrak ala al-Sahihain
Book of Knowledge of the Companions - The Will of Hudhayfa ibn al-Yaman
Volume: (3) - Page Number: (381)
5683 - Ahmad ibn Jaafar al-Qatti'i narrated to us, saying: Abdullah ibn Ahmad ibn Hanbal narrated to me, from my father, from Muhammad ibn Bakr, who said: Isra'il narrated to me, from Maysarah ibn Habib, from al-Minhhal ibn Amr, from Zar ibn Hubaysh, from Hudhayfa from the Prophet (peace be upon him and his holy progeny), who said: "Gabriel (peace be upon him and his holy progeny) came to me and said, 'Indeed, Hasan and Husayn are the leaders of the young men of the people of Paradise.'" Then the Messenger of Allah (peace be upon him and his holy progeny) said to me, "God has forgiven you and your mother, O Hudhayfa."

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Reference: Al-Mustadarak ala al-Saheehain Book 3