"Do not argue with your brother, do not joke with him, and do not make a promise, only to not fulfill it."
Jami` at-Tirmidhi Book 27, Hadith 101
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Jami` at-Tirmidhi Book 27, Hadith 100 Next Hadith → "A man sought permission to enter upon the Messenger of Allah while I was with him, so he said: 'What an evil son of his tribe, or brother of his tribe.' Then he admitted him and spoke with him. When he left, I said: 'O Messenger of Allah! You said what you said about him. Then you talked politely with him?' He said: 'O 'Aishah! Indeed among the evilest of people are those whom the people avoid, or who the people leave, fearing his filthy speech.'"

Jami` at-Tirmidhi Book 27, Hadith 102