SEPHER YETZIRAH The Book of Creation and SEPHER HA-BAHIR The Book of Illumination

Sefer Yetzirah is the title of the earliest extant book on Jewish esotericism, although some early commentators treated it as a treatise on mathematical and linguistic theory as opposed to Kabbalah

Sefer HaBahir is an anonymous mystical work, attributed to a 1st-century rabbinic sage Nehunya ben HaKanah,It is an early work of esoteric Jewish mysticism which eventually became known as Kabbalah