Muwatta Malik, Book 47, Hadith 1636 (In-Book) ⓘ
Yahya related to me from Malik that Muadh ibn Jabal said, "The last advice the Messenger of Allah, may Allah bless him and grant him peace, gave me when I put my foot in the stirrup was that he said, 'Make your character good for the people, Muadh ibn Jabal!' "
وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّ مُعَاذَ بْنَ جَبَلٍ، قَالَ آخِرُ مَا أَوْصَانِي بِهِ رَسُولُ اللَّهِ صلى الله عليه وسلم حِينَ وَضَعْتُ رِجْلِي فِي الْغَرْزِ أَنْ قَالَ " أَحْسِنْ خُلُقَكَ لِلنَّاسِ يَا مُعَاذُ بْنَ جَبَلٍ " .
also referenced under: Book 47, Hadith 1 (USC-MSA)