Hadith No: 1
Ahmad ibn Hanbal - Musnad Imam Ahmad ibn Hanbal
Musnad of the Ten Blessed with Paradise - Musnad of the Rightly Guided Caliphs
And from the Musnad of Ali ibn Abi Talib (r)
Volume: (1) - Page Number: (99)
776 - Hajjaj narrated to us, saying: Israel narrated to me, from Abu Ishaq, from Hani, from Ali (r), who said: "Al-Hasan is the most similar of people to the Messenger of Allah (peace be upon him and his holy progeny) in appearance from the chest to the head, while Al-Husayn is the most similar of people to the Prophet (peace be upon him and his holy progeny) in appearance in what is below that."

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Reference: Musnad Ahmad Ibn Hanbal Book 1

Hadith No: 2
Al-Haythami - Majma' al-Zawa'id wa Manba' al-Fawa'id
Book of Virtues - Chapter on What Was Narrated About al-Hasan ibn Ali (RA)
Volume: (9) - Page Number: (176)
15038 - And Ali (RA) said: "The person who resembled the Messenger of Allah (peace be upon him and his holy progeny) the most was al-Hasan, from his head to his chest." This was narrated by al-Tabarani, and its narration is considered good.

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Reference: Majma al-Zawaaed wa Mamba' al-Fawaaed Book 9

Hadith No: 3
Al-Tabarani - al-Mu'jam al-Kabir - Chapter on the Letter Ha - Al-Husayn ibn Ali ibn Abi Talib (ra)
Volume: (3) - Page Number: (96)
2771 - Muhammad ibn Abdullah al-Hadrami narrated to us, saying: Abu Kuraib narrated to us, saying: Muhammad ibn Ubad ibn Abi Zaidah narrated to us, saying: Yahya ibn Zakariya ibn Abi Zaidah narrated to us, from his father, from Abu Ishaq, from Hubayra ibn Yareem from Ali (ra), who said: "The person who resembled the Messenger of Allah (peace be upon him and his holy progeny) the most, from his head to his chest, was al-Hasan."

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Reference: al-Mo'jam al-Kabeer Book 3

Hadith No: 4
Ibn Hibban - Sahih Ibn Hibban - The Book of His (peace be upon him) Reports about the Virtues of the Companions, Their Men
Mentioning the Conclusive Report Between These Two Narrations That Appear to Contradict Each Other
Volume: (15) - Page Number: (430)
6974 - Mohammad ibn Isma'il al-Thaqafi narrated to us, saying: Al-Hasan ibn Muhammad ibn al-Sabbah narrated to us, saying: Shababah narrated to us, saying: Israel narrated to us, from Abu Ishaq, from Hani ibn Hani from Ali, who said: "Al-Hasan is the most similar of people to the Messenger of Allah (peace be upon him and his holy progeny), in appearance and stature, from the chest to the head," and Al-Husayn is the most similar of people to the Messenger of Allah (peace be upon him and his holy progeny), in appearance and stature, in all that is beneath that."

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Reference: Saheeh Ibn Hibbaan Book 15

Hadith No: 5
Al-Muttaqi al-Hindi - Kanz al-Ummal fi Sunan al-Aqwal wa-l-Af'al
Volume: (13) - Page Number: (659)
37676 - Narrated from Ali, who said: "Whoever wishes to see the person most resembling the Messenger of Allah (peace be upon him and his holy progeny) in appearance, from his neck to his face, should look at Hasan ibn Ali." And whoever wishes to see the person most resembling the Messenger of Allah (peace be upon him and his holy progeny) in creation and color, from his neck to his ankle, should look at Husayn ibn Ali.
37677 - Narrated from Ali, who said: "Whoever wants to see the face of the Messenger of Allah (peace be upon him and his holy progeny) from his head to his neck should look at Hasan." And whoever wants to see his form from his neck to his legs should look at Husayn; they divided this resemblance between them.

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Reference: Kanz al-Ummaal fi Sunan al-Aqwaal wa al-Af'aal Book 13