Hadith No: 1
Ibn Hajar al-Asqalani - Al-Matalib al-Aliyyah bi-Zawa'id al-Masanid ath-Thamaniyyah - Book of Virtues
Chapter on the Merits of Fatimah (peace be upon her) over her Father and Ali (peace be upon them) and the Virtue of Her Sons (peace be upon them)
Volume: (16) - Page Number: (155)
3949 - Abu Bakr said: Zayd ibn al-Habbab narrated to us, from Isra'il, from Maysarah ibn Habib al-Nahdi, from al-Munhal ibn Amr, from Zur ibn Hubaysh, from Hudhayfah, who said: "I came to the Messenger of Allah (peace be upon him and his holy progeny) and prayed with him the Maghrib prayer, then he stood and prayed until he performed the Isha prayer. Then he left, and I followed him." He said: "An angel appeared to me and asked my Lord for permission to greet me and give me the glad tidings that Fatimah is the Mistress of the Women of the People of Paradise, and that Hassan and Hussein are the Masters of the Youths of the People of Paradise."

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Reference: Al-Mataaleb al-Aaleyah BeZawaaed al-Masaaneed al-Samaaneyah Book 16

Hadith No: 2
Ibn Hajar al-Asqalani - Al-Matalib al-Aliyah bi-Zawa'id al-Masanid al-Thamaniyah - Book of Virtues
Chapter on the Virtues of Fatimah (peace be upon her) over her Father and Husband (peace be upon them) and the Virtue of Her Sons (peace be upon them)
Volume: (16) - Page Number: (196)
3965 - Abu Bakr said: Abu al-Ahwas narrated to us from Abu Ishaq from Ali, 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 youth of the people of Paradise," and its narrators are trustworthy.

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Reference: Al-Mataaleb al-Aaleyah BeZawaaed al-Masaaneed al-Samaaneyah Book 16

Hadith No: 3
Ibn Hajjar al-Asqalani - Al-Isabah fi Tamyiz al-Sahabah - Supplement to the Letter Meem
Section Four: Those Mentioned in the Companions Incorrectly Whose Names Initially Begin with Meem - Meem Followed by Aleph - 8498: Malik ibn al-Hasan
Volume: (6) - Page Number: (252)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... And al-Baghawi narrated it in the biography of Malik ibn al-Huwayrith al-Laythi, another hadith from this chain, with the wording: "Al-Hasan and al-Husayn are the masters of the youth of the People of Paradise, and their father is better than them."

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Reference: Al-Isaabah Fi Tamyeez al-Sahaabah Book 6

Hadith No: 4
Ibn Hajar al-Asqalani - Tahdhib al-Tahdhib - Chapter on the letter Ha - Those Whose Name is al-Hasan
528 - al-Hasan ibn Ali ibn Abi Talib al-Hashimi
Volume: (2) - Page Number: (295 > 297)
[The text is lengthy, so only the relevant excerpt is provided here]
528 - al-Hasan ibn Ali ibn Abi Talib al-Hashimi, the grandson of the Messenger of Allah (peace be upon him and his holy progeny) and his flower in this world, one of the two masters of the youth of Paradise: .... And Abu Sa'id al-Khudri and others said from the Prophet (peace be upon him and his holy progeny): "Al-Hasan and al-Husayn are the masters of the youth of Paradise," adding that their father is better than them.

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Reference: Tazheeb al Tahzeeb Book 2