The classical doctrine of "hisba", associated with the Quranic injunction of "enjoining good and forbidding wrong", refers to the duty of Muslims to promote moral rectitude and intervene when another Muslim is acting wrongly. Historically, its legal implementation was entrusted to a public official called "muhtasib" (market inspector), who was charged with preventing fraud, disturbance of public order and infractions against public morality. This office disappeared in the modern era everywhere in the Muslim world, but it was revived in Arabia by the first Saudi state, and later instituted as a government committee responsible for supervising markets and public order. It has been aided by volunteers enforcing attendance of daily prayers, gender segregation in public places, and a conservative notion of hijab. Committee officers were authorized to detain violators before a 2016 reform. With the rising international influence of Wahhabism, the conception of "hisba" as an individual obligation to police religious observance has become more widespread, which led to the appearance of activists around the world who urge fellow Muslims to observe Islamic rituals, dress code, and other aspects of Sharia.