Seraphim: Who Are the Burning Angels of Isaiah

The seraphim are heavenly beings that Sacred Scripture mentions explicitly only once: in the inaugural vision of the prophet Isaiah, in the temple of Jerusalem (Is 6:1-7). The Hebrew name, seraphim (שְׂרָפִים), is the plural of saraph and means literally “the burning ones,” “those who burn.” Isaiah sees them standing beside the throne of God, each one with six wings, crying out to one another the threefold “Holy” that the liturgy repeats to this day in the Sanctus of the Mass. In later theological tradition, above all from Pseudo-Dionysius the Areopagite onward, the seraphim came to be counted as the highest of the nine angelic choirs, the circle closest to the divine throne.

The Text of Isaiah 6: The Only Vision of the Seraphim

The scene takes place “in the year that King Uzziah died” (Is 6:1), around 740 B.C. The prophet sees the Lord seated on a high and lofty throne, and the hem of His robe fills the temple. Above Him stand the seraphim:

שְׂרָפִ֨ים עֹמְדִ֤ים ׀ מִמַּ֙עַל֙ ל֔וֹ שֵׁ֧שׁ כְּנָפַ֛יִם שֵׁ֥שׁ כְּנָפַ֖יִם לְאֶחָ֑ד בִּשְׁתַּ֣יִם ׀ יְכַסֶּ֣ה פָנָ֗יו וּבִשְׁתַּ֛יִם יְכַסֶּ֥ה רַגְלָ֖יו וּבִשְׁתַּ֥יִם יְעוֹפֵֽף׃

“Seraphim were standing above Him. Six wings, six wings each one had: with two he covered his face, with two he covered his feet and with two he flew” (Is 6:2, literal translation of the Masoretic text).

וְקָרָ֨א זֶ֤ה אֶל־זֶה֙ וְאָמַ֔ר קָד֧וֹשׁ ׀ קָד֛וֹשׁ קָד֖וֹשׁ יְהֹוָ֣ה צְבָא֑וֹת מְלֹ֥א כׇל־הָאָ֖רֶץ כְּבוֹדֽוֹ׃

“And one cried out to another, saying: Holy, holy, holy is YHWH of hosts; the fullness of the whole earth is His glory” (Is 6:3, literal translation).

At the cry, the doorposts shake and the temple fills with smoke. Isaiah acknowledges himself to be “a man of unclean lips” and then receives the only gesture that Scripture attributes to a seraph besides praise: “one of the seraphim flew to me, and in his hand a burning coal, which he had taken with tongs from the altar. And he touched it upon my mouth and said: Behold, this has touched your lips; your iniquity is taken away and your sin will be expiated” (Is 6:6-7, literal translation). The burning one purifies with fire. His closeness to God does not shut him up in himself: it makes him a minister of the holiness he contemplates, and from the purification the prophet’s mission is born.

What saraph Means: The Burning Ones

The word saraph comes from the Hebrew root that means “to burn,” “to consume with fire.” The plural seraphim therefore designates “the burning ones,” “the incandescent ones.” Outside Isaiah 6, the Old Testament uses the same term for the fiery serpents of the desert (Num 21:6-8) and for flying serpents (Is 14:29 and 30:6), which has led exegetes to debate the background image of the vision. In Isaiah 6, however, the seraphim are clearly personal beings: they have a face, feet, wings, hands and a voice; they speak, they fly and they carry out a ministry of purification.

It is worth noting that Isaiah does not call them mal’akh, the common Hebrew word for “messenger” or “angel,” whose range we explain in the article on what angel means in Hebrew. “Angel” is the name of an office, not of a nature, as Saint Augustine teaches, cited by the Catechism (CCC 329). “Seraph,” on the contrary, describes a way of being: the spiritual creature as set ablaze by the closeness of the divine fire. Christian tradition has read in that name the symbol of perfect charity, the love that burns before God without being consumed.

The Six Wings Explained

The most famous detail of the vision is the distribution of the six wings, which the text itself explains. With two the seraph covers his face: not even the highest of creatures can gaze directly upon the glory of God, and the gesture is adoration and reverence. With two he covers his feet: in biblical language, the gesture veils the creature before the Creator and confesses that even the burning one is a creature, not God. With two he flies: he remains ready for service, as the flight to Isaiah with the coal from the altar shows.

Four wings cover, two serve. The proportion is already a theology: in the seraphim, adoration precedes and enfolds mission. And the scene as a whole corrects a pious image that has become a habit. Isaiah’s seraph is not the decorative cherub of later art, the winged child of the altarpieces. It is a tremendous presence, before which the prophet feels lost, and which Rilke still sensed when he wrote that every angel is terrifying. To recover that numinous beauty, which fascinates and makes one tremble at the same time, is to give back to faith in the angels its seriousness, against every esoteric or sentimental trivialization.

From the Temple to the Liturgy: The Sanctus

The threefold “Holy” of Is 6:3 did not remain in the prophet’s book. It passed into the worship of the Church and became the Sanctus, the acclamation that opens the Eucharistic Prayer at every Mass. The Catechism of the Catholic Church teaches expressly:

“In her liturgy, the Church joins with the angels to adore the thrice-holy God; she invokes their assistance (as in the prayer ‘In paradisum deducant te angeli – may the angels lead you into paradise’ of the Liturgy of the Dead, or again in the ‘Cherubic Hymn’ of the Byzantine Liturgy), and she celebrates in a more particular way the memorial of certain angels” (CCC 335).

To join: the verb is decisive. In the Sanctus the Church does not imitate the angels from afar; she really unites herself to the praise they have never interrupted. The liturgy of earth is the liturgy of heaven already begun, and the visible assembly discovers itself surrounded by the invisible assembly. The Directory on Popular Piety and the Liturgy recalls, along the same lines, that the faithful know that the angels “lodano incessantemente il Signore,” praise the Lord unceasingly, citing precisely Is 6:1-4 (Directory on Popular Piety and the Liturgy, n. 214, our translation). From this it can be seen that the proper place of the seraph is not ancient cosmology, which has passed away, but worship, which remains: defined by a cosmic function, the angel falls with the cosmology; defined by the liturgical office, he is as perennial as adoration. The seraphim are, so to speak, the liturgists par excellence of the temple of the universe.

The Seraphim in the Celestial Hierarchy

From the names that Scripture provides, tradition organized the angelic world into choirs. Pseudo-Dionysius the Areopagite, in the work On the Celestial Hierarchy (fifth-sixth century), placed the seraphim at the summit of the first triad, above the cherubim and the thrones, a scheme that Saint Gregory the Great and Saint Thomas Aquinas took up and that became fixed in the list of the nine choirs of angels. The logic is simple: if the name says “burning,” the seraph is the spirit most set ablaze by the love of God, and for that reason the closest.

It is important to distinguish the levels. The existence of the angels is sure doctrine: “The existence of the spiritual, non-corporeal beings that Sacred Scripture usually calls angels is a truth of faith” (CCC 328). The division into nine choirs, on the other hand, is venerable theology, not dogma. And the Dionysian hierarchy itself must be read rightly: not as a pyramid of power, but as a chain of illumination, in which the superior does not dominate the inferior but enlightens him, transmitting the light that he himself receives. Within this framework, the seraphim are the first mirrors of the glory, alongside other figures of the prophetic vision, such as the mysterious wheels of Ezekiel, full of eyes all around (Ezek 1:18).

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