Ye are the best of peoples, evolved for mankind, enjoining what is right, forbidding what is wrong, and believing in Allah. If only the People of the Book had faith, it were best for them: among them are some who have faith, but most of them are perverted transgressors.
"Those who follow the apostle, the unlettered Prophet, whom they find mentioned in their own (scriptures), - in the law and the Gospel; - for he commands them what is just and forbids them what is evil; he allows them as lawful what is good (and pure) and prohibits them from what is bad (and impure); He releases them from their heavy burdens and from the yokes that are upon them. So it is those who believe in him, honour him, help him, and follow the light which is sent down with him, - it is they who will prosper."
And the faithful men, and the faithful women are friends one to another: They command that which is just, and they forbid that which is evil; and they are constant at prayer, and pay their appointed alms; and they obey God, and his apostle: Unto these will God be Merciful; for He [is] Mighty [and] Wise.
Abu Sa`id Al-Khudri (May Allah be pleased with him) reported that the messenger of Allah said, "Whoever amongst you sees an evil, he must change it with his hand; if he is unable to do so, then with his tongue; and if he is unable to do so, then with his heart; and that is the weakest form of Faith". (Reported in Sahih Muslim).