Siffin and the Prophet's Words

In the first civil strife among the Muslims, 'Ammar stood with 'Ali ibn Abi Talib. At Siffin he was in his nineties. The Companions remembered the Prophet's ﷺ words that a transgressing party would kill him, and when he fell, it was widely taken as confirmation of what the Prophet ﷺ had said (Sahih Muslim 2916).

This is one of the most delicate subjects in the history of the Companions. Sunni scholars respect all the Companions and do not curse or disparage any of them. They generally hold that 'Ali was nearer to the truth in that conflict, and that Mu'awiyah and those with him were mujtahids who had interpreted the matter differently, and acted in a way the scholars regard as an error, but for which they may be forgiven. Shi'a Muslims read the event differently and with much harsher judgment of Mu'awiyah's side.

'Ammar was buried in his clothes as a martyr. He had begun as a tortured slave's son in Makkah and ended as an old man giving his life for what he believed was right. What the Muslims take from it is to be just about the dead on all sides and to ask Allah's mercy on all of them.