 ...Cook, Forbidding Wrong, p.89-90 Who did the enforcing Islamic legal scholars differ regarding who precisely was (and is) responsible for carrying out commanding and forbidding, what was to be commanded and forbidden, who was to be commanded and forbidden, and what was involved in this commanding and forbidding. For example, schools of law differ over whether Hisbah is an individual or collective duty, (i.e. an individual obligation of all believers, or if leaving enforcement to just some Muslims was sufficient).
<meaning-changed>  ...Cook, Forbidding Wrong, p.89-90 Who did the enforcing Islamic legal scholars differ regarding who precisely was (and is) responsible for carrying out commanding and forbidding, what was to be commanded and forbidden, who was to be commanded and forbidden, and what was involved in this commanding and forbidding. For example, schools of law differ over whether Hisbah is an individual or collective duty, (i.e. an individual obligation of all believers, or if leaving enforcement to just some Muslims was sufficient).
 ...Cook, Forbidding Wrong, p.89-90 