The Zohar (Hebrew: זהר, lit Splenor or Radiance) is widely considered the most important work of Kabbalah, or Jewish mysticism. It is a mystical commentary on the Torah (the five books of Moses), written in medieval Aramaic. It contains a mystical discussion of the nature of God, the origin and structure of the universe, the nature of souls, sin, redemption, good and evil, and related topics.