Sayyiduna Amr bin Shas (may Allah be pleased with him) narrates: The Prophet Muhammad (peace and blessings be upon him) said to me, "You have caused me harm." We said, "O Messenger of Allah! I do not like that I should cause you any harm." The Prophet Muhammad (peace and blessings be upon him) said, "Whoever causes harm to Ali has caused harm to me."
(Imam Ibn Hibban, may Allah have mercy on him, says:) This narrator is Fadl bin Abdullah bin Muqil bin Sinan Ashja'i. Ibn Ishaq has attributed him to his grandfather, while the narrator named Mas'ud bin Sa'd, who is a Kufan, his kunyah is Abu Sa'd.