Hadith 516220
Chapter 47: Good Character - كتاب حسن الخلق
وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ قَدْ بَلَغَهُ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " بُعِثْتُ لأُتَمِّمَ حُسْنَ الأَخْلاَقِ " .
Yahya related to me from Malik that he had heard that the Messenger of Allah, may Allah bless him and grant him peace, said, "I was sent to perfect good character."
Reference Muwatta Malik 516220
USC-MSA web (English) reference : Book 47, Hadith 8