It is narrated through trustworthy chains of narrators from Imam Ja’far Sadiq (a.s.) that a person came to the Messenger of Allah (S) and said: “O Allah’s messenger, dispense some advice to me.” The Prophet said: “Never become angry.” He said: “I will act on this.” And he returned from there. When he came to his people, he found them in a serious dispute divided into two ranks and they were all armed. When he saw this he was infuriated.
He also armed himself to fight when he remembered the Prophet’s advice. He immediately took off the weapons and came to the group that was inimical to his party. He said: “O people, I shall recompense you for whatever wounds you have suffered and all those who have been killed from you.” They said, “We forgive all that we have lost in the battle and we are more deserving of this generosity.” So peace was made between the two parties and anger was removed from their hearts.