Hadith 650:7
'Affan narrated to us, Hammam narrated to us, with this chain of narration, he said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "The two who insult one another are two devils who belie one another and disparage one another."
حدثنا عفان، حدثنا همام، بهذا الإسناد قال: قال رسول الله صلى الله عليه وسلم: " المستبان شيطانان يتكاذبان، ويتهاتران "