Shimon bar Yochai in the context of "Midrash"

Academic study of Jewish mysticism, especially since Gershom Scholem's Major Trends in Jewish Mysticism (1941), draws distinctions between different forms of mysticism which were practiced in different eras of Jewish history. Of these, Kabbalah, which emerged in 12th-century southwestern Europe, is the most well known, but it is not the only typological form, nor was it the first form which emerged. Among the previous forms were Merkabah mysticism (c. 100 BCE – 1000 CE), and Ashkenazi Hasidim (early 13th century) around the time of the emergence of Kabbalah.

Kabbalah means "received tradition", a term which was previously used in other Judaic contexts, but the Medieval Kabbalists adopted it as a term for their own doctrine in order to express the belief that they were not innovating, but were merely revealing the ancient hidden esoteric tradition of the Torah. This issue has been crystalized until today by alternative views on the origin of the Zohar, the main text of Kabbalah, attributed to the circle of its central protagonist Rabbi Shimon Bar Yochai in the 2nd century CE, for opening up the study of Jewish Mysticism. Traditional Kabbalists regard it as originating in Tannaic times, redacting the Oral Torah, so do not make a sharp distinction between Kabbalah and early Rabbinic Jewish mysticism. Academic scholars regard it as a synthesis from the Middle Ages, when it appeared between the 13th and 15th centuries, but assimilating and incorporating into itself earlier forms of Jewish mysticism, possible continuations of ancient esoteric traditions, as well as medieval philosophical elements.

The Zohar (Hebrew: זֹהַר‎, romanized: Zōhar, lit. 'Splendor' or 'Radiance') is a foundational work of Kabbalistic literature. It is a group of books including commentary on the mystical aspects of the Torah and scriptural interpretations as well as material on mysticism, mythical cosmogony, and mystical psychology. The Zohar contains discussions of the nature of God, the origin and structure of the universe, the nature of souls, redemption, the relationship of ego to darkness and "true self" to "the light of God".

The Zohar was first publicized by Moses de León (c. 1240 – 1305 CE), who claimed it was a Tannaitic work recording the teachings of Simeon ben Yochai (c. 100 CE). This claim is universally rejected by modern scholars, most of whom believe de León, also an infamous forger of Geonic material, wrote the book himself between 1280 and 1286. Some scholars argue that the Zohar is the work of multiple medieval authors and/or contains a small amount of genuinely antique novel material. Later additions to the Zohar, including Tiqqune hazZohar and Ra'ya Meheimna, were composed by a 14th century imitator.

Moses de León (c. 1240 – 1305), known in Hebrew as Moshe ben Shem-Tov (משה בן שם-טוב די-ליאון‎), was a Spanish rabbi and Kabbalist who first publicized the Zohar. Modern scholars believe the Zohar is his own work, despite his claim to have copied it out of an ancient manuscript by Shimon ben Yochai. His other works include Sefer ha-Rimon, written in Hebrew, and hundreds of pseudepigraphic responsa, commentaries, and Kabbalistic tracts which he falsely attributed to earlier authorities.

The Mekhilta of Rabbi Shimon ben Yochai (Jewish Babylonian Aramaic: מכילתא דרבי שמעון בן יוחאי, romanized: Mǝkhilta dǝ-Rabbi Shimʿon ben Yoḥai) is midrash halakha on the Book of Exodus from the school of Rabbi Akiva attributed to Shimon bar Yochai.

No midrash of this name is mentioned in Talmudic literature, but Nachmanides (d.1270) refers to one which he calls either Mekhilta de-Rabbi Shimon ben Yochai, Mekhilta Achǝrita de-Rabbi Shimon, or simply Mekhilta Acheret. Todros ben Joseph Abulafia (d.1285) also refers to Mekhilta de-Rabbi Shimon ben Yochai.