ابن قيم الجوزية
From an Islamic legal perspective, the pledge of protection granted dhimmis the freedom to practice their religion and spared them forced conversions. The dhimmis also served a variety of useful purposes, mostly economic, which was another point of concern to jurists. Religious minorities were free to do whatever they wished in their own homes, but could not "publicly engage in illicit sex in ways that threaten public morals". In some cases, religious practices that Muslims found repugnant were allowed. One example was the Zoroastrian practice of incestuous "self-marriage" where a man could marry his mother, sister or daughter. According to the famous Islamic legal scholar Ibn Qayyim Al-Jawziyya (1292–1350), non-Muslims had the right to engage in such religious practices even if it offended Muslims, under the conditions that such cases not be presented to Islamic Sharia courts and that these religious minorities believed that the practice in question is permissible according to their religion. This ruling was based on the precedent that Muhammad did not forbid such self-marriages among Zoroastrians despite coming in contact with them and having knowledge of their practices.