In the Persian period, the Torah, which is made up of various law collections, was ascribed to Moses as revealed by YHWH. A parallel development was taking place in Achaemenid Persia that sheds light on this process: The sacred texts called the Avesta, that contain the law (dāta) and tradition (daēnā) of Zoroastrianism, were being collectively ascribed to Zarathustra (Zoroaster) as revealed by Ahuramazdā.
Dr.
Yishai Kiel
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