Abu Sa'id Al-Khudri, may Allah be pleased with him, narrates from the Messenger of Allah, peace and blessings be upon him, that he said: "Whoever among you sees an evil, let him change it with his hand; if he is not able to do so, then with his tongue; and if he is not able to do that, then with his heart (by planning to change it and by hating it), and that is the weakest level of faith." Narrated by Muslim.