Musnad Ahmed: Hadith 3163

When the Harooriyyah (Khawarij) rebelled, they withdrew from people, I said to them: On the day of al-Hudaibiyah the Messenger of Allah (ﷺ) made a peace deal with the mushrikeen. He said to 'Ali. "O 'Ali, write, "This is what Muhammad the Messenger of Allah has agreed.” They said: If we knew that you were the Messenger of Allah, we would not have fought you. The Messenger of Allah (ﷺ) said, "Erase it, O ‘Ali. O Allah, You know that l am Your Messenger. Erase it, O ‘Ali, and write: "This is what Muhammad bin ‘Abdullah has agreed.” By Allah, the Messenger of Allah was better than 'Ali, but he erased that himself and erasing it does not mean denying his Prophethood. Have I answered this point? They said: Yes.