The word's field
Rūḥ belongs to a triconsonantal root, r-w-ḥ, that gathers a family of meanings around moving air and relief: the same consonants give rīḥ (wind), rāḥa (rest, ease), and rawḥ (mercy, respite, the cool of breath). Against that background rūḥ names the spirit — but a spirit conceived first as breath in motion rather than as an immaterial substance. Where a neighboring word such as nafs carries the self, the appetitive soul, the person who can be reproached and refined, rūḥ names something given from above and never fully owned: it descends, it is breathed in, it strengthens, it is sent. The two words divide the field the way spirit and soul divide it in the Western languages, and the Arabic lexical tradition kept them distinct even while acknowledging their overlap.
The commentarial tradition treats rūḥ as one of the deliberately reticent words of the revelation. Its most-discussed appearance is a verse in which the Prophet is questioned about the rūḥ and told to answer only that it belongs to the command, the amr, of his Lord, and that humankind has been given little knowledge of it. Exegetes read this as a boundary marker: the rūḥ is real, active, and central, yet its nature is withheld. From that reticence the classical writers built several readings held together at once — the rūḥ as the life-breath that animates the body, as the angelic messenger who carries revelation, as the figure named the rūḥ al-qudus, the holy spirit, and as the created agency by which God quickens both the dead earth and the human heart. The word thus sits where anthropology and angelology meet: it is what makes a body live and what carries the word of God down into the world.
In the corpus
The Arabic corpus here is the complete Quran — a single work, and the whole of it, not a thin sampling. Within that one work the lemma rūḥ is recorded 21 times, across 1 work. Because the corpus is closed and canonical, that figure is the total attestation of the word in its founding text. Twenty-one occurrences place rūḥ among the words the revelation returns to at charged moments rather than in passing — at the creation of the human form, at the annunciation to Mary, at the descent of the revelation itself, and at the strengthening of the prophets. The distribution is concentrated by theme rather than spread evenly: the word clusters where breath, message, and quickening are at stake, which is precisely the semantic knot the root ties together.
Canonical moments
At the creation of the first human, God shapes the form from clay and then breathes into it of His own rūḥ, at which point the angels are commanded to prostrate. The verse The Quran 15:29 makes the rūḥ the exact hinge between inert matter and a living, honored creature: the human becomes worthy of the angels' prostration only once the divine breath is in the form. The same act is stated again for the conception of Jesus, where God breathes of His rūḥ into the one who guarded her chastity — The Quran 21:91 — binding the origin of the individual life and the origin of a singular prophetic life under one verb and one word.
The annunciation makes the rūḥ a sent figure rather than a diffuse breath. In The Quran 19:17, God's rūḥ is dispatched to Mary and appears to her in the likeness of a well-formed man — the spirit here is an agent with a form, a messenger who arrives. This personal, delegated sense of the word runs alongside its function in revelation itself: in The Quran 16:102 the rūḥ al-qudus, the holy spirit, brings the revelation down from the Lord in truth, so that the word that quickens the body and the word that carries scripture are named by the same term.
The strengthening of Jesus draws the two senses together. Twice the text states that God supported or strengthened Jesus son of Mary with the rūḥ al-qudus — The Quran 2:87 and again The Quran 2:253 — so that the holy spirit is not only the bringer of the message but the sustaining power behind the messenger. And where the word's own nature is at issue, The Quran 17:85 supplies the deciding note: asked about the rūḥ, the Prophet is told to answer that it is of the amr of his Lord (see amr), and that only a little knowledge of it has been given. The verse both centers the word and seals it, which is why the commentarial tradition returns to it first.
The word's world
Rūḥ stands in the Arabic soul-vocabulary as the term of descent and gift, over against nafs, the self that must be disciplined, and near qalb, the heart into which the spirit's effects are felt, and sadr, the breast that is opened or straitened to receive them. Its closest sibling across the traditions is the Hebrew rûaḥ, with which it shares not only a cognate root but the whole arc from moving air to the Spirit of God — the breath that hovers at creation in one canon and is breathed into the clay in the other. Through the Hebrew the word reaches the Greek pneuma and the Latin spīritus, the terms the biblical translators used to carry breath, wind, and Spirit as a single unbroken sense; rūḥ holds that same triple charge in Arabic, with the added, deliberately guarded sense that its inmost nature is withheld. Set beside the Sanskrit prāṇa, the breath that carries life through the body, rūḥ shares the physiology of the animating breath while parting from it on the question of source: prāṇa is the life-wind coursing within the living being, whereas rūḥ is always given from beyond it, breathed in, sent down, never generated by the creature it enlivens.
Grounding: corpus figures and citations from the live Logoi corpus record (receipt soul-word-journey-v0). Cross-references: nafs, qalb, amr, rûaḥ, pneuma, prāṇa.