Hasidic Judaism, or Hasidism, (Hebrew:חסידות‎, hasidut, Ashkenazic pronunciation: [χaˈsidus]; originally, "piety") is a popular mystical movement within Judaism. Hasidic teachings emphasize the need to cleave and be one with God at all times, the divine immanence suffusing the universe, the devotional aspect of religious practice and the spiritual dimension of corporeality and mundane acts. It draws heavily on Lurianic Kabbalah, and to an extent is a popularization of it. Hasidim, the adherents of the movement, are organized in independent sects, each headed by its own leader, known as Rebbe. Obedience and submission to the Rebbe are a key tenet of Hasidism, as he is considered a spiritual authority with whom the follower must bond to gain closeness to God.