Hadith No: 1
Ahmad ibn Hanbal - Musnad Imam Ahmad ibn Hanbal
Musnad of the Ten Who Were Given Glad Tidings of 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 the people to the Messenger of Allah (peace be upon him and his holy progeny) in appearance from the chest to the head, and Al-Husayn is the most similar of the people to the Prophet (peace be upon him and his holy progeny) in appearance in all that is below that."

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Reference: Musnad Ahmad Ibn Hanbal Book 1

Hadith No: 2
Ahmad ibn Hanbal - Fada'il al-Sahabah - Fada'il al-Hasan wa al-Husayn (ra)
Volume: (2) - Page Number: (774)
1366 - Abdullah narrated to us, he said: My father narrated to me, he said: Hajjaj narrated to me, he said: Israel narrated to me, from Abu Ishaq, from Hani', from Ali, who said: "Hasan is the most resembled of people to the Messenger of Allah (peace be upon him and his holy progeny) in appearance, from the chest to the head, and Husayn is the most resembled of people to the Prophet (peace be upon him and his holy progeny) in appearance, in all that is below that."

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Reference: Fazael al-Sahabah Book 2

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: (95)
2769 - Muhammad ibn Abdullah al-Hadhrami narrated to us, who said: I found in the book of Uqbah ibn Qubaysah: My father narrated to us from Hamzah al-Zayyat, from Abu Ishaq, from Hubayrah ibn Yareem from Ali, who said: "Whoever wishes 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 wishes to see what is from his neck onward should look at Husayn. They resembled each other."

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

Hadith No: 4
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 Abd Allah al-Hadrami narrated to us, who said: Abu Kuraib narrated to us, who said: Muhammad ibn Abbas ibn Abi Zaa'ida narrated to us, who said: Yahya ibn Zakariya ibn Abi Zaa'ida narrated to us, from his father, from Abu Ishaq, from Hubayra ibn Yariyim, from Ali (ra) who said: "The person who most resembled the Messenger of Allah (peace be upon him and his holy progeny) from his head to his chest was Al-Hasan."

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

Hadith No: 5
Al-Usbahani - Ma'rifat al-Sahabah - Letter ha - Those Named al-Hasan
Abu Abdullah al-Husayn ibn Ali ibn Abi Talib, the Fragrance of the Messenger of Allah (peace be upon him and his holy progeny)
Volume: (2) - Page Number: (663)
1768 - Ahmad ibn al-Harith al-Marwabi narrated to us, saying: Muhammad ibn Abdullah al-Hadhrami narrated to us, Abdullah ibn Muhammad ibn Salem narrated to us, Ibrahim ibn Yusuf ibn Abi Ishaq narrated to us, from his father, from Abu Ishaq, from Hubayra ibn Yarim, 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 what is between his neck and face and in his hearing, let him look at al-Hasan. And whoever wishes to see the person most resembling the Messenger of Allah (peace be upon him and his holy progeny) in what is between his neck and his ankles, in both appearance and complexion, let him look at al-Husayn ibn Ali."

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Reference: Ma'refat As-Sahabah Book 2

Hadith No: 6
Al-Ajuri - al-Shari'ah - Book on the Virtues of Hasan and Husayn (RA)
Chapter on the Likeness of Hasan and Husayn (RA) to the Messenger of Allah (peace be upon him and his holy progeny)
Volume: (5) - Page Number: (2145)
1631 - Abu Muhammad Yahya ibn Muhammad ibn Sa'id narrated to us, who said: Ahmad ibn Uthman ibn Hakim al-Audi narrated to us, who said: Shu'ayb ibn Muslimah al-Tanukhiy narrated to us, who said: Ibrahim ibn Yusuf narrated to us, from his father, from Abu Ishaq, that he heard Hubayrah ibn Yarim say that he heard Ali (RA) say: "Whoever finds joy in seeing the person who most resembles the Messenger of Allah (peace be upon him and his holy progeny) from his neck to his face and in his hair, let him look at Hasan ibn Ali." And whoever finds joy in seeing the person who most resembles the Messenger of Allah (peace be upon him and his holy progeny) in form from his neck to his ankles, let him look at Husayn ibn Ali (RA).

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Reference: Al-Sharee'ah Book 5

Hadith No: 7
Al-Muntaqi al-Hindi - Kanz al-Ummal fi Sunan al-Aqwal wal-Af'al
Volume: (13) - Page Number: (659)
37676 - Ali said: "Whoever is pleased to see the person most similar to the Messenger of Allah (peace be upon him and his holy progeny) in what is between his neck and his face should look at Hasan bin Ali." And whoever is pleased to see the person most similar to the Messenger of Allah (peace be upon him and his holy progeny) in what is between his neck and his ankles, in creation and color, should look at Husayn, son of Ali."
37677 - Ali 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 what is from his neck to his feet should look at Husayn; they resembled each other."

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