Muwatta Imam Malik Book of Good Character, Hadith 1

Yahya related to me from Malik that Muadh ibn Jabal said, "The last advice the Messenger of Allah ﷺ 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 ﷺ حِينَ وَضَعْتُ رِجْلِي فِي الْغَرْزِ أَنْ قَالَ " أَحْسِنْ خُلُقَكَ لِلنَّاسِ يَا مُعَاذُ بْنَ جَبَلٍ " .