The Sepher Bahir is one of the foremost works of all mystic Judaism, an important work of Kabbalah in which commentaries on sounds, words, and stories are presented in a somewhat choppy form (for it was a compiled manuscript, not a primordial single work.) The work is ascribed to a mystic rabbi named Nehunya circa the first century. It refers as well to another mystic work- the famous Sepher Yetzirah, equally as renowned for its spiritual lore.