Islam commands us to do good and avoid evil

Believers learn the true meaning of good and evil from the Qur'an, a book revealed by Allah as the standard by which to discern the true from the false." Concepts such as good and bad, right and wrong, are elucidated in the Qur'an with examples that everyone can understand. Believers' fear of Allah gives them light and understanding to help them distinguish between good and bad. (Surat al-Anfal: 29)

Muslims spend their whole lives implementing their awareness of the good and evil, as described in the Qur'an. Yet they also assume another important responsibility, inviting others to see the truth, to avoid evil and to live by the morality of the Qur'an. Believers spend their lives telling people about the difference between good and evil, because to the faithful, Allah has given the following command: 

Let there be a community among you who call to the good, and enjoin the right, and forbid the wrong. They are the ones who have success. (Surah Al'Imran: 104)

In  the Qur'an, Allah stresses how those who abide by this commandment are much more auspicious than others:

You are the best nation ever to be produced before mankind. You enjoin the right, forbid the wrong and believe in Allah. If the People of the Book were to believe, it would be better for them. Some of them are believers, but most of them are deviators. (Surah Al 'Imran: 110)

The faithful perform that Qur'anic duty not only in respect of those ignorant of the difference between right and wrong and with no knowledge of religion, but also in respect of the faithful themselves. People fall into error not only out of ignorance, but sometimes out of forgetfulness, by mistake or when driven by earthly desires. Thus, the faithful encourage good and prevent evil by reminding one another of the Qur'an's commandments. They warn each other that in this world, those who fail to avoid evil will suffer the torments of hell,and that only those who do good and devoutly carry out their religious obligations will be rewarded with paradise. That delightful responsibility means that they never need feel wearied or discouraged while continuing to warn others compassionately and affectionately, no matter what mistakes they might have made. In many verses, Allah reveals that He loves those who have patience, and calls on the faithful to be patient when practicing the morality of the Qur'an:

You who believe! Seek help in steadfastness and prayer. Allah is with the steadfast. (Surat al-Baqara: 153)

… Those who are steadfast and do right actions. They will receive forgiveness and a large reward. (Surah Hud: 11)