Kabbalists view their mystical knowledge as originating with the revelation at Mount Sinai and thereafter being communicated orally from master to disciple. Eventually Kabbalistic teachings were written down. Kabbalists incorporate their own worldview and symbols into their readings of the Bible and earlier works of Jewish mysticism. Eventually, Kabbalists gave expression to their traditions and practices through books. The first book of this kind to emerge was Sefer HaBahir, the Book of Illumination.