Is it obligatory or merely recommended to forbid evil individually, and how does one forbid evil in the presence of a group, and what is the ruling if those committing the evil are more than one person, and there are those in the same gathering who are not committing the evil?

It is recommended to admonish an individual who commits a sin privately, if they are not openly defiant, and to prefer offering advice discreetly. However, for someone who openly commits a sin, it is not recommended to conceal their action. Rather, their matter should be referred to the ruler if no greater harm is feared. It is preferable to confront and reprimand them so that they and others may be deterred. It is obligatory to forbid evil, to the best of one's ability, for someone who commits it in a public gathering.