Translation
(78) Good Manners and Form (Al-Adab)
كتاب الأدب
(44) Chapter: Calling bad names and cursing
(44) باب مَا يُنْهَى مِنَ السِّبَابِ وَاللَّعْنِ
Sahih al-Bukhari 6046 

Narrated Anas:

Allah's Messenger (ﷺ) was neither a Fahish (one who had a bad tongue) nor a Sabbaba (one who abuses others) and he used to say while admonishing somebody, "What is wrong with him? May dust be on his forehead!"

حَدَّثَنَا مُحَمَّدُ بْنُ سِنَانٍ، حَدَّثَنَا فُلَيْحُ بْنُ سُلَيْمَانَ، حَدَّثَنَا هِلاَلُ بْنُ عَلِيٍّ، عَنْ أَنَسٍ، قَالَ لَمْ يَكُنْ رَسُولُ اللَّهِ صلى الله عليه وسلم فَاحِشًا وَلاَ لَعَّانًا وَلاَ سَبَّابًا، كَانَ يَقُولُ عِنْدَ الْمَعْتَبَةِ ‏ "‏ مَا لَهُ، تَرِبَ جَبِينُهُ ‏"‏‏.‏
Reference : Sahih al-Bukhari 6046
In-book reference : Book 78, Hadith 76
USC-MSA web (English) reference : Vol. 8, Book 73, Hadith 72
  (deprecated numbering scheme)