Ibn 'Abbas said, "Two men defamed one another in the time of the Messenger of Allah (ﷺ). One of them reviled the other who remained silent. The Prophet (ﷺ) remained seated. Then the other man answered him back and the Prophet (ﷺ) got up. He was asked, "You got up?" He said, "The angels left, so I left with them. While this man was silent, the angels were answering the one who cursed him. When he answered, the angels left."

Umm ad-Darda' reported that a man came up to her and said, "A man has said bad things about you in the presence of 'Abdu'l-Malik.' She said, "We are suspected of something which we did not do. How often we have been praised for what we did not do!"

Abdullah said, "When a man says to his companion, 'You are my enemy,' then one of them has left Islam or he is innocent of what his companion said.'"

Ibn 'Abbas said, "There are 360 joints and each of them owes sadaqa every single day. Every good word is sadaqa. A man's helping his brother is sadaqa. A drink of water which he gives is sadaqa. Removing something harmful from the road is sadaqa."

Abu Hurayra reported that the Prophet (ﷺ) said, "When two people revile each other, the responsibility for what they say rests on the first to speak as long as the one who wronged does not become excessive."

As 423, but from Anas.

The Prophet (ﷺ) said, "Do you know what calumny is?" They said, "No, Allah and His Messenger know best." He said, "Telling people what other people have said in order to create dissension between them."

The Prophet (ﷺ) said, "Allah Almighty revealed to me that you should be humble and that you should not wrong one another."

Iyad ibn Himar said, "I said, 'Messenger of Allah, there is someone who reviles me.' The Prophet (ﷺ) said, 'Those who revile one another are two shaytans who accuse one another and deny one another.'"