Is it obligatory to forbid evil if a person knows that the evil will not change?

Question : This is a matter of whether a person is content with forbidding evil once, or whether he repeats it.

Answer : We say he repeats it. This is based on the question: Is it obligatory to forbid evil when one is convinced that it will not be of benefit? Some scholars hold that if you are convinced that your forbidding will not be of benefit, you do not forbid it.
Because there is no benefit in it. Others hold that you forbid it, and this is the correct view, even if the only benefit of forbidding is to make it clear that this is evil. For if you remain silent while you are considered a leader among your people, people will say this is proof that you are not one of them. The stronger view is that you forbid it, even if you are convinced that it will not be of benefit.
The Shaykh: Therefore, the people of , a group from among them said to those who rebuked them: ? They replied: You may think it will not benefit, but it does benefit. Yes.