Sahih Bukhari
Good Manners and Form (Al-Adab)
Volume: 008 / Book Number: 073 / Hadith Number: 61
Narrated Masruq:
We were sitting with 'Abdullah bin 'Amr who was narrating to us (Hadith): He said, "Allah's Apostle was neither a Fahish nor a Mutafahhish, and he used to say, 'The best among you are the best in character (having good manners)."'