Sahih Muslim Book 32, Hadith Number 6195.
Chapter : Kindness towards the friends of one’s father and mother.
Nawwas b. Sim’an al-Ansiri reported: I asked Allah’s Messenger (may peace be upon him) about virtue and vice. He said: Virtue is a kind disposition and vice is what rankles in your heart and that you disapprove that people should come to know of it.