Bundahishn

The Bundahishn (Middle Persian: , "Primal Creation") is an encyclopedic collection of beliefs about Zoroastrian cosmology written in the Book Pahlavi script. The original name of the work is not known. It is one of the most important extant witnesses to Zoroastrian literature in the Middle Persian language. Most of the chapters of the compendium date to the 8th and 9th centuries CE.

Although the Bundahishn draws on the Avesta and develops ideas alluded to in those texts, it is not itself scripture. The content reflects Zoroastrian scripture, which, in turn, reflects both ancient Zoroastrian and pre-Zoroastrian beliefs. In some cases, the text alludes to contingencies of post-7th century Islam in Iran, and in yet other cases, such as the idea that the Moon is farther than the stars.