(23) باب صِفَةِ النَّبِيِّ صلى الله عليه وسلم
Narrated `Abdullah bin `Amr:
The Prophet (ﷺ) never used bad language neither a "Fahish nor a Mutafahish. He used to say "The best amongst you are those who have the best manners and character." (See Hadith No. 56 (B) Vol. 8)
Reference: Sahih al-Bukhari 3559
In-book reference: Book 61, Hadith 68
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 4, Book 56, Hadith 759