According to Ahmad ibn Hanbal, these verses were followed to the letter at the times of Muhammad, when Jews and Christians, considered monotheists, were still allowed to Al-Masjid Al-Haram. However, the Umayyad caliph Umar II later forbade non-Muslims from entering mosques, and his ruling remains in practice in present-day Saudi Arabia. Today, the decision on whether non-Muslims should be allowed to enter mosques varies. With few exceptions, mosques in the Arabian Peninsula as well as Morocco do not allow entry to non-Muslims. For example, the Hassan II Mosque in Casablanca is one of only two mosques in Morocco currently open to non-Muslims.