Commanding decency and forbidding wickedness
In the koranic verses God commands believers to command each other towards decency and forbidding wickedness. The two koranic verses confirm the importance of this Islamic issue:
1. Believers, whether men or women, must [act as] friends to one another they should command decency and forbid wickedness , keep up prayer, and pay the welfare tax as well as obey God and his messenger. Those God will grant mercy to, God is Powerful, Wise! (9:71)
2. Let there be a community among you who will invite [others] to [do] good, command what is proper and prevent dishonor, those will be prosperous. (3:104)
Sources :
The Noble Koran (English translation by T.B.Irving)
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