Itris bin Urqub al-Shaybani came to Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) and said: Destroyed is the one who does not enjoin good and forbid evil. He said: "Rather, destroyed is the one whose heart does not recognise good and whose heart does not reject evil."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 8532