Hereditary Sanctity: Zoroastrian and Abrahamic Priesthoods Compared

Both traditions vest religious authority in patrilineal descent, and in both the descent claim fails under historical and molecular scrutiny — but they fail differently, and the difference is instructive. Zoroastrianism preserves prophetic descent as an eschatological reserve while running its priesthood as a hereditary caste; Judaism and Samaritanism preserve a genealogical charter whose institutional history shows repeated rupture. This study compares the official claimants in each tradition, the mechanisms by which each handles the failure of a line, and the limits of genetic verification. Introduction: Priesthoods that vest authority in descent face a problem that purely vocational priesthoods do not: lines fail. Sons are not born, families are destroyed, registers are lost, and political power reassigns offices regardless of pedigree. How a tradition handles that failure reveals what the descent claim was actually doing. The Zoroastrian and Abrahamic traditions offer an unusually clean comparison. Both are West Asian, both emerge from the same broad cultural zone in the first millennium BCE, and both make patrilineal descent a condition of priestly office. They also came into sustained institutional contact: the Iranian Magi and the Babylonian temple scholars worked the same cities under Achaemenid rule, and Jewish communities lived under Iranian administration from Cyrus to the Sasanians (Panaino, 2017; Secunda, 2014). But the two traditions solve the problem of lineage failure in opposite ways. Zoroastrianism separates prophetic descent from priestly office: the prophet's line is withdrawn from history and preserved as an eschatological reserve, while the priesthood operates as a hereditary caste making no claim to descend from Zarathustra personally. Judaism and Samaritanism fuse them: the priesthood claims descent from a specific ancestor, Aaron, and the claim is genealogical in form, producing a register that can be — and repeatedly was — broken. This study examines the official claimants in each tradition: who holds priestly office, on what basis, and what the documentary and molecular record can establish about those claims. It does not evaluate the religious validity of either, which is not a question evidence of this kind can address. A terminological note: Abrahamic is used here in the narrow sense of the Israelite-Samaritan priestly traditions descending from the Pentateuchal charter. Islamic conceptions of prophetic descent (the sayyid and sharif lineages) operate on different principles and are outside this scope, though they constitute a third case worth separate treatment.