Nasu and Druj-e-Nasu: Zoroastrian Purity Laws at Death

What Is Nasu?

In Zoroastrian theology, Nasu is the spiritual and physical pollution that emanates from a dead body. The moment the life force (ruvan) departs, the demon Druj-e-Nasu — literally "the Lie of Putrefaction" — takes possession of the corpse. This is not a metaphor. The tradition treats Nasu as a real, transmissible contamination that can infect living people, animals, sacred elements, and objects that come into contact with the deceased.

Every aspect of Zoroastrian funeral practice — who touches the body, how it is bathed, where it is placed, what materials are used, who may view it, and how it is ultimately disposed of — follows from this single theological premise.

How Nasu Shapes Funeral Practice

Containment Through Isolation

After the Sachkar (body consecration), the body is placed on marble slabs and surrounded by three concentric circles called kash, drawn on the floor with an iron nail. Iron is specifically chosen because it is considered a non-conductor of spiritual infection.

These circles create a physical and spiritual boundary. No one may cross them without proper protection — specifically, the sudreh (sacred undershirt) and kusti (sacred cord) that every initiated Zoroastrian wears. Non-Zoroastrians are categorically excluded from this zone, not from disrespect but because they lack the spiritual armature to resist the Nasu.

The Paiwand Connection

Because the Nasu intensifies and disperses every time the body is moved, everyone involved in the funeral must work in pairs, connected by a paiwand — a white handkerchief or cord held between two people. This physical link combines the internal spiritual fire-energy (Atashe-Vohufryan) of both individuals, creating a double-strength protective field.

The paiwand rule applies to the nasesalars (corpse-bearers) during the Sachkar, the mobeds (priests) during the Geh Sarna, and all mourners during the Paidust procession.

Iron and Its Properties

The funeral bier (gehan) is made of iron, as is the nail used to draw the kash circles. The tradition holds that iron does not transmit Nasu.

Families working with non-Zoroastrian funeral directors should discuss the required materials and handling with their local mobed, rather than assume that standard funeral-home equipment follows local ritual practice.

The Cardinal Prohibition of the North

The body must never be laid with the head pointing North. The North is associated in Zoroastrian cosmology with cold winds and Ahrimanic (evil) forces. Prayers must not be recited facing North. This applies in Mumbai's bunglis and equally in a Western funeral home chapel, where the family may need to request that the body be repositioned.

Who Can and Cannot Approach the Body

The Nasu contamination rules create strict access tiers:

May approach and touch: Initiated Zoroastrians wearing sudreh and kusti, after performing padyab-kusti (purification). The nasesalars have the most direct contact; priests maintain a three-pace distance even during the liturgy.

May not approach: Non-Zoroastrians under any circumstances. Zoroastrians who are not wearing sudreh and kusti. Uninitiated children. Women during menstruation (a traditional rule that is variously observed in different communities).

These rules create some of the most painful moments in modern Zoroastrian funerals, particularly for interfaith families. A non-Zoroastrian spouse may be unable to view their own partner's body after the Sachkar. Children of interfaith marriages may be denied entry to the bungli. The theology is clear, but the human cost is real.

Purification After Contact

Those who have handled the body or taken part in the procession should perform the padyab-kusti afterward: washing the face, hands, and feet, reciting the Kem na Mazda, and untying and retying the kusti. The nasesalars undergo more intensive purification rituals given their direct exposure.

In Mumbai, the bungli pavilions are purpose-built with marble and stone surfaces that can be ritually cleansed between funerals.

The Modern Tension

The Nasu concept creates real friction in diaspora settings. Western mortuaries operate with the assumption that a body is a body — to be handled, embalmed, cosmeticized, and displayed according to the family's preferences. Zoroastrian purity laws impose a fundamentally different framework: the body is a contamination source, to be handled minimally, by specific people, with specific protections, and disposed of rapidly.

Communicating these requirements to a funeral director who has never encountered them requires clear, written instructions — not a theological lecture, but a practical specification sheet.

The Zoroastrian (Parsi) Funeral Guide includes a printable Funeral Director Briefing Sheet designed for exactly this purpose, translating the Nasu handling requirements into professional, actionable language that morticians can follow.