After the death or Occultation of Muhammad ibn Ismaill in the 8th century, the teachings of Ismailism further transformed into the belief system as it is known today, with an explicit concentration on the deeper, esoteric meaning ("bāṭin") of the faith. With the eventual development of Twelverism into the more literalistic "(zahir)" oriented Akhbari and later Usuli schools of thought, Shi'ism developed in two separate directions: the metaphorical Ismailli group focusing on the mystical path and nature of God and the divine manifestation in the personage of the "Imam of the Time" as the "Face of God", with the more literalistic Twelver group focusing on divine law ("sharī'ah") and the deeds and sayings ("sunnah") of Muhammad and his successors (the "Ahlu l-Bayt"), who as A'immah were guides and a light to God.