Zoroaster scholars, philosophers, and theologians to test his knowledge on religion and jurisprudence. Among the summoned scholars was a Zoroastrian High Priest. Al-Ridha questioned the priest on his beliefs saying,“Tell me about Zoroaster, whom you claim is a prophet; what is your evidence for his Prophethood?” to which the response was “We did not see him, but the tales of our ancestors informed us that he had legalized for us what no other person before had made legal.” Imam Al-Ridha responded “This is the case with all other nations. Tales had come to them about what the prophets had accomplished, what
Zoroaster all claimed that Zoroaster originated from "their" homelands, some of which then decided that Zoroaster must then have then been buried in their regions or composed his Gathas there or preached there. Also Arabic sources of the same period and the same region of historical Persia consider Azerbaijan as the birthplace of Zarathustra. By the late 20th century, most scholars had settled on an origin in eastern Greater Iran. Gnoli proposed Sistan, Baluchistan (though in a much wider scope than the present-day province) as the homeland of Zoroastrianism; Frye voted for Bactria and Chorasmia; Khlopin suggests the Tedzen Delta in