The customary position with the people of Sufism, particularly in the Shadhili and the Darqawi tariqah, is that a person will not be a sheik without having had a background in the basic disciplines of the Qur'an and Sunna. This is the position of Imam Junayd. However, in unusual circumstances there have been exceptions to this rule, among them the famous wali, Abd al-Aziz ad-Dabbagh of Fez, and in the Darqawi tariqah, the sheik Sidi al-'Arabi ibn al-Huwari from whom sheik Muhammad ibn al-Habib took the tariqah, and most famously sheik Ahmad al-Alawi, a master of Sufism whom all accept without reservation.