The Prophet (ﷺ) said: The most prevalent kind of usury is going to lengths in talking unjustly against a Muslim's honour.
Sunan Abi Dawud Book 43, Hadith 104
← Previous Hadith I said to the Prophet (ﷺ): It is enough for you in Safiyyah that she is such and such (the other version than Musaddad's has:) meaning that she was short-statured. He replied; You have said a word which would change the sea if it were mixed in it. She said: I imitated a man before him (out of disgrace). He said: I do not like that I imitate anyone even if I should get such and such.

Sunan Abi Dawud Book 43, Hadith 103 Next Hadith → The Prophet (ﷺ) said: The gravest sin is going to lengths in talking unjustly against a Muslim's honour, and it is a major sin to abuse twice for abusing once.

Sunan Abi Dawud Book 43, Hadith 105