مُوَطَّأُ مَالِكٍ
Muwatta Malik 1643
Good Character
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, (ﷺ), said, "I was sent to perfect good character."
Arabic/English book reference: Book 47, Hadith 8