Seder Rabbah di-Bereshit

Seder Rabbah di-Bereshit (Hebrew: סדר רבה דבראשית, "The Greater Order of Creation"), also transmitted under the title Maʿaseh Bereshit ("The Work of Creation"), is a late antique Jewish cosmological tractate dating to the post-Talmudic or early geonic period. It represents the most extensive surviving Jewish treatment of cosmology from late antiquity and is closely associated in the manuscript tradition with Hekhalot and Merkavah literature.

Seder Rabbah di-Bereshit occupies a unique position in Jewish intellectual history as the first known Jewish text to articulate a fully symmetrical cosmology in which heaven and earth (specifically, the seven heavens and the seven earths), mirror one another structurally and theologically. Its synthesis of apocalyptic, rabbinic, and mystical traditions makes it a key source for the study of early Jewish cosmology and the development of medieval Jewish mysticism.