Maliks Muwatta Book 047, Hadith Number 001.

Section : Good Character.

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!'"