Source books · Jewish mysticism and Kabbalah

3 Enoch

ספר היכלות

Rabbi Ishmael · Final redaction 5th–6th century CE; Byzantine or Babylonian provenance contested

How this book fits

Traditions
Jewish mysticism and Kabbalah
Role in the tradition
Primary source Written from inside the tradition: scripture, revelation, a grimoire, a manifesto or a practical treatise.
Public attention
Major Wikipedia has an article about it in 20 languages.

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From Wikipedia

The Third Book of Enoch, also known as The Book of the Palaces, The Book of Rabbi Ishmael the High Priest and The Elevation of Metatron, and abbreviated as 3 Enoch) is a Jewish apocryphal book.

From the Wikipedia article 3 Enoch, revision 1327254957, under CC BY-SA 4.0. Wikidata Q3257262: “Jewish apocryphal text”.

In this study

Third Enoch is a central source for the tradition in which Enoch is elevated and transformed into Metatron. It develops Metatron's heavenly offices and titles, including Prince of the Divine Presence, within the world of Hekhalot mysticism.

Primary mystical evidence for Metatron's identity and offices, independent of the much later Kether correspondence.

Cited for 2 sourced claims here, among them correspondences of Metatron.