Four thousand years ago, along the banks of the Oxus and across the plains of the Sapta Sindhu, two peoples shared the same gods, the same hymns, and a sacred plant whose name alone changed depending on which shore you stood on. On one side, the Vedic people called this plant soma. On the other, the Iranians of the Avesta named it haoma. A single consonant separates them — the Indo-Aryan s becoming h in Old Iranian — and this phonetic shift is one of the most elegant proofs that both civilizations were born from the same source.
A Common Root
Linguists confirm it: the proto-Indo-Iranian *sauma gave rise to both words. This systematic shift from s to h appears across all Iranian languages — it is visible in the very name of Ahura Mazda, the supreme Iranian god, whose Vedic counterpart is Asura, and more specifically Varuna, lord of cosmic order. This is no isolated coincidence: it testifies to the gradual separation of two branches of the same community, somewhere between 2000 and 1500 BCE.
The Vedic soma is celebrated in no fewer than one hundred and twenty hymns of the Rig Veda, gathered in Book IX — the Soma Mandala — entirely devoted to this plant. The Iranian haoma occupies a central place in the Avesta, the sacred text of Zoroastrianism, where it appears as a deity in its own right, an intercessor between humans and gods.
The Gods Who Cross the Border
What strikes us when comparing the two pantheons is not their differences but their deep kinship. Names evolved, roles were sometimes redistributed, but the great divine figures remain recognizable on both sides.
Mitra / Mithra: god of contract and alliance, he is in the Rig Veda one of the Ādityas, son of Aditi, guardian of moral order. In Iran, Mithra becomes one of the most important deities of the Avestan tradition, and later of the Mithraic cult that spread all the way to Rome.
Varuna / Ahura Mazda: Varuna in the Vedas is the sovereign of cosmic order, the ṛta, omniscient and just. Ahura Mazda — ahura being the exact Iranian equivalent of asura in its original sense of « powerful lord » — is Zarathustra’s supreme god, master of universal order, the asha.
Indra / Indra: here the name is identical. But the status has changed. In the Rig Veda, Indra is king of the gods, the warrior deity par excellence, slayer of the serpent Vritra. In the Avesta, Indra has become a demon, a daêva — a sign of the Zoroastrian reform that inverted the hierarchy of divine forces.
Nāsatya / Nāŋhaiθya: the Vedic divine twins, the Ashvins, are called Nāsatya in the texts. In Avestan Iranian, Nāŋhaiθya has also become a demon — another trace of the same religious reformation.
Sarasvatī / Haraxvaitī: the Vedic river goddess, patron of speech and wisdom, finds her exact counterpart in the Iranian river goddess Haraxvaitī, associated with the Arghandab river in present-day Afghanistan. Same goddess, same nature, same root.
Agni / Ātar: the sacred fire. In the Rig Veda, Agni is the god of fire, messenger between humans and gods, present in every sacrifice. In Zoroastrianism, Ātar, the sacred fire, plays exactly the same central role — the Iranian fire temples (atashkadeh) are its direct continuation.
The Mysterious Plant
What was this plant? The debate is not closed. The most serious hypotheses include Psilocye Cubensis, Ephedra, Amanita muscaria (the red and white mushroom), Peganum harmala (Syrian rue), or various other psychoactive plants from Central Asia. What is certain is that soma / haoma was pressed, filtered, mixed with milk or water, and consumed during rituals to induce an altered state of consciousness favorable to dialogue with the gods.
The Rig Veda describes the preparation of soma with a precision suggesting a ritual codified across generations: the stalks of the plant are crushed between stones (grāvan), the juice is filtered through wool, then blended. The Avesta describes a similar process for haoma. The same sacred gestures, the same pressing stones, the same chants — four thousand kilometers apart.
Two Sister Civilizations
This parallelism is not merely an academic curiosity. It reveals that Vedic and Iranian civilizations are not two separate worlds but two branches of the same tree. They share a common cosmology — the order of the world (ṛta / asha) against chaos (anṛta / druj) — a shared ethic of contract and the given word, and a shared vision of fire as the bond between the human and the divine.
Ancient Iran and Vedic India remind us that the boundaries between peoples are always more recent than their common roots. Soma and haoma are two names for the same reverence before the mystery of life.
Le Rig Veda 
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