was also an influential early figure, as was Junayd of Baghdad; a number of early practitioners of Sufism were disciples of one of the two. Sufi orders Historically, Sufis have often belonged to "orders" known as (pl. ) – congregations formed around a grand master who will trace their teaching through a chain of successive teachers back to the Islamic prophet Muhammad. These orders meet for spiritual sessions () in meeting places known as , or . They strive for (perfection of worship), as detailed in a : "Ihsan is to worship Allah as if you see Him; if you can't see Him, surely He sees you." Sufis regard Muhammad as , the complete human who personifies the attributes of Absolute Reality, and view him as their ultimate spiritual guide. Sufi orders trace most of their original precepts from Muhammad through Ali ibn Abi Talib, with the notable exception of the Naqshbandi order, who trace their original precepts to Muhammad through Abu Bakr. However, it was not necessary to formally belong to a tariqa. In the Medieval period, Sufism was almost equal to Islam in general and not limited to specific orders. Sufism had a long history already before the subsequent institutionalization of Sufi teachings into devotional orders (tariqa, pl. tarîqât) in the early Middle Ages. The term tariqa is used for a school or order of Sufism, or especially for the mystical teaching and spiritual practices of such an order with the aim of seeking ḥaqīqah (ultimate truth). A tariqa has a murshid (guide) who plays the role of leader or spiritual director. The members or followers of a tariqa are known as murīdīn (singular murīd), meaning "desirous", viz. "desiring the knowledge of knowing God and loving God". Over the years, Sufi orders have influenced and been adopted by various Shi'i movements, especially Isma'ilism, which led to the Safaviyya order's conversion to Shia Islam from Sunni Islam and the spread of Twelverism throughout Iran. Prominent tariqa include the Ba 'Alawiyya, Badawiyya, Bektashi, Burhaniyya, Chishti, Khalwati, Kubrawiya, Madariyya, Mevlevi, Muridiyya, Naqshbandi, Nimatullahi, Qadiriyya, Qalandariyya, Rahmaniyya, Rifa'i, Safavid, Senussi, Shadhili, Suhrawardiyya, Tijaniyyah, Uwaisi and Zahabiya orders. Sufism as an Islamic discipline Existing in both Sunni and Shia Islam, Sufism is not a distinct sect, as is sometimes erroneously assumed, but a method of approaching or a way of understanding the religion, which strives to take the regular practice of the religion