Sahih al-Bukhari 6035
Narrated Masruq:
We were sitting with `Abdullah bin `Amr who was narrating to us (Hadith): He said, "Allah's Messenger (ﷺ) 
was neither a Fahish nor a Mutafahhish, and he used to say, 'The best among you are the best in 
character (having good manners)."'
حَدَّثَنَا عُمَرُ بْنُ حَفْصٍ، حَدَّثَنَا أَبِي، حَدَّثَنَا الأَعْمَشُ، قَالَ حَدَّثَنِي شَقِيقٌ، عَنْ مَسْرُوقٍ، قَالَ كُنَّا جُلُوسًا مَعَ عَبْدِ اللَّهِ بْنِ عَمْرٍو يُحَدِّثُنَا إِذْ قَالَ لَمْ يَكُنْ رَسُولُ اللَّهِ صلى الله عليه وسلم فَاحِشًا وَلاَ مُتَفَحِّشًا، وَإِنَّهُ كَانَ يَقُولُ ‏
"‏ إِنَّ خِيَارَكُمْ أَحَاسِنُكُمْ أَخْلاَقًا ‏"‏‏.‏