Hadith No: 1
Al-Khatib al-Baghdadi - Tarikh Baghdad
Mentioning the account of al-Mada'in in brief and naming those from the righteous companions who visited it - Al-Hasan and Al-Husayn
Volume: (1) - Page Number: (468)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... Muhammad ibn Ahmad ibn Rizq narrated to us, saying: Abd al-Samad ibn Ali ibn Muhammad narrated to us, saying: Al-Husayn ibn Sa'id ibn Azhar al-Sulami narrated to us, saying: Qasim ibn Yahya ibn al-Hasan ibn Zayd ibn Ali narrated to me, saying: Abu Hafs al-A'sha informed us from Aban ibn Taghlib from Abu Ja'far from Ali ibn al-Husayn from Husayn ibn Ali from Ali 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 boys of the inhabitants of Paradise, and their father is better than them."

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Reference: Taareekh Baghdad Book 1

Hadith No: 2
Al-Khatib al-Baghdadi - Tarikh Baghdad (History of Baghdad) - Volume on the letter Alif
Mention of those named Isaak - 3350: Isaak ibn Abdullah ibn Abi Badr al-Qutrubli
Volume: (7) - Page Number: (399)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... Abu Muhammad Abdullah ibn Ali ibn Iyaad al-Qadi in Sur said: Abu Muhammad Abdullah ibn Ali ibn Iyaad al-Qadi in Sur narrated to us, saying: Muhammad ibn Ahmad ibn Jumay al-Ghassani narrated to us, saying: Muhammad ibn al-Husayn ibn Ubayd ibn Hamdoon the Hafiz, known as Ibn Ajjal, narrated to us, saying: Isaak ibn Abdullah ibn Abi Badr al-Qutrubli narrated to us, saying: Husayn ibn Muhammad al-Marwazi narrated to us, saying: Israel narrated to us, from Maysarah ibn Habib, from al-Munhal ibn Amr, from Zur ibn Hubayish from Hudhayfah from the Prophet (peace be upon him) who said, "Al-Hasan and al-Husayn are the princes of the youths of the people of Paradise."

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Reference: Taareekh Baghdad Book 7

Hadith No: 3
Al-Khatib al-Baghdadi - Tarikh Baghdad (History of Baghdad) - Chapter on the letter 'Ayn
Mention of those named Abd al-Rahman - 5313: Abd al-Rahman ibn Amir, Abu al-Aswad
Volume: (11) - Page Number: (498)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... Al-Hasan ibn Abi Bakr narrated to us, saying: Ahmad ibn Kamal al-Qadi informed us. Ahmad ibn Ali al-Kharrraz narrated to us. Al-Haytham ibn Kharaqah, Abu Ahmad, narrated to us. Abd al-Rahman ibn Amir, Abu al-Aswad, mawla of the Banu Hashim, narrated to us, from Asim ibn Abi al-Najud, fromZur ibn Hubaysh, from Hudhayfah, who said: "We saw signs of joy on the face of the Messenger of Allah (peace be upon him and his holy progeny), so we said, 'O Messenger of Allah, we have seen signs of joy on your face today.'" He replied, "And why should I not be joyful, when Gabriel has come to me and given me the glad tidings that Hasan and Husayn are the masters of the youth of the people of Paradise, and their father is better than them?" ....

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Reference: Taareekh Baghdad Book 11