Thirukkural

அறங்கூறான் அல்ல செயினும் ஒருவன் புறங்கூறான் என்றல் இனிது.

Arangooraan Alla Seyinum Oruvan Purangooraan Endral Inidhu

Though one do not even speak of virtue and live in sin, it will be well if it be said of him "he does not backbite."