One should never defile anything by eye, mind, or speech. Nor should one do anything which is wrong, openly or in secret.
न चक्षुषा न मनसा न वाचा दूषयेत् क्वचित्। न प्रत्यक्षं परोक्षं वा किंचिद् दुष्टं समाचरेत्॥