Hadith No: 1
Ahmad ibn Hanbal - Musnad Imam Ahmad ibn Hanbal
Musnad al-Makkiyyin - Hadith of Amr ibn Sha's al-Aslami (r)
Volume: (3) - Page Number: (483)
15530 - Ya'qub ibn Ibrahim narrated to us, saying: My father narrated to us, saying: Muhammad ibn Ishaq narrated to us, from Aban ibn Salih, from al-Fadl ibn Abdullah ibn Ma'qil ibn Sinan, from Abdullah ibn Niyar al-Aslami, from Amr ibn Sha's al-Aslami, who said: "And he was one of the companions of Hudaybiyyah." He continued: "I went out with Ali to Yemen, and he distanced himself from me during that journey, so I felt something in myself against him. When I returned, I began to show my complaint about him in the mosque until that reached the Messenger of Allah (peace be upon him and his holy progeny). I entered the mosque one morning, and the Messenger of Allah (peace be upon him and his holy progeny) was with some of his companions. When he saw me, he fixed his eyes on me, saying: 'Narrow your gaze at me,' until I sat down. Then he said: 'O Amr, by Allah, you have indeed harmed me.' I said: 'I seek refuge with Allah from harming you, O Messenger of Allah!' He replied: 'Yes, whoever harms Ali, harms me.'"

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Reference: Musnad Ahmad Ibn Hanbal Book 3

Hadith No: 2
Ahmad ibn Hanbal - Fada'il al-Sahabah (Virtues of the Companions) - Virtues of Ali (peace be upon him)
Volume: (2) - Page Number: (579)
981 - Abdullah narrated to us, who said: My father narrated to us, from Ya'qub, from my father, from Muhammad ibn Ishaq, from Aban ibn Salih, from al-Fadl ibn Ma'qal ibn Sinan, from Abdullah ibn Niyyar al-Aslami, from Amr ibn Shas al-Aslami, who was one of the companions of Hudaybiyyah. He said: I went out with Ali to Yemen, and he was unkind to me during that journey, to the point that I felt resentment towards him. When I returned, I feigned a complaint in the mosque, and this reached the Messenger of Allah (peace be upon him and his holy progeny). One morning, I entered the mosque while the Messenger of Allah (peace be upon him and his holy progeny) was in it with some of his companions. When he saw me, he narrowed his eyes at me, saying with his gaze, "Look intently at me," until I sat down. Then he said: "O Amr, by Allah, you have indeed hurt me." I replied: "I seek refuge in Allah from hurting you, O Messenger of Allah!" He said: "Indeed, whoever harbors resentment against Ali has hurt me."

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Reference: Fazael al-Sahabah Book 2

Hadith No: 3
Ahmad ibn Hanbal - Fada'il al-Sahabah - And Among the Virtues of Ali (peace be upon him)
And among the virtues of Ali (may Allah be pleased with him) from the narration of Abu Bakr ibn Malik from his teachers, except for Abdullah
Volume: (2) - Page Number: (633)
1078 - Ibrahim ibn Abdullah narrated to us, who said: Sulayman ibn Ahmad narrated to us, saying: Marwan ibn Muawiya narrated to us, from Qanan ibn Abdullah, who said: I heard Mus'ab ibn Sa'd narrating from his father, who said: The Messenger of Allah (peace be upon him and his holy progeny) said: "Whoever harms Ali has harmed me."

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Reference: Fazael al-Sahabah Book 2

Hadith No: 4
Ahmad ibn Hanbal - Fada'il al-Sahabah - And Among the Virtues of Ali (peace be upon him)
And among the virtues of Ali (may Allah be pleased with him) from the narration of Abu Bakr ibn Malik from his teachers, except for Abdullah
Volume: (2) - Page Number: (641)
1089 - Al-Fadl ibn al-Habbab al-Basri narrated to us in Basra, saying: Al-Qa'nabi Abdullah ibn Muslimah narrated to us, and Ibn Luheiah narrated to us, from Abu al-Aswad, from Urwah, who was the son of al-Zubair, that a man spoke ill of Ali ibn Abi Talib in the presence of Umar. Umar said to him: "Do you know the owner of this grave?" He is Muhammad ibn Abdullah ibn Abdul-Muttalib, and Ali ibn Abi Talib ibn Abdul-Muttalib so do not mention Ali except in good, for if you harbor hatred towards him, you will be harming this one in his grave.

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Reference: Fazael al-Sahabah Book 2