The Vision of the Temple and the Vocation of Isaiah — Isa 6:1-13

The vocation of Isaiah, dated «the year of the death of King Uzziyàhu» (around 740 BCE), is a theophany in the Temple of Jerusalem: the prophet sees Adonài seated on a lofty throne, the serafìm («the burning ones») proclaiming the triple Qadòsh, the purification of his lips with the coal from the altar, the prophetic commissioning, and the oracle of the hardening of the people. The primary meaning is historical: a call situated in a precise year, not an atemporal scene; and cultic: the scene unfolds in the Hekhàl, in accordance with the language of Temple worship. The structure follows the classic schema of vocation narratives — vision, commissioning, the called one's objection, reassurance — the same as Moses at the burning bush (Ex 3) and Jeremiah (Jer 1): not a private experience, but the juridical investiture of an envoy.

Historical reconstruction: 740 BCE and the Assyrian crisis

The death of Uzziyàhu (Uzziah) marks the end of a long reign and the beginning of the Assyrian shadow looming over Judah. The chronicle records that the king had died a leper, excluded from the Temple (2 Chr 26,21): the earthly throne stands vacant and defiled, and precisely in that year the prophet sees the true King seated on the heavenly throne, high and exalted (vv. 1.5: «my eyes have seen the King, the Tetragrammaton Tzevaòt»). The title that runs throughout the entire book — the «Holy One of Israel» — originates here, from the triple Qadòsh. The oracle of hardening (vv. 9–13) and the announcement of the desolation of the cities find their historical horizon in the Assyrian campaigns that, within a few decades, would deport the northern kingdom and reduce Judah to a surviving «tenth»: the prophecy does not describe atemporal scenarios but the imminent political catastrophe, read as divine judgment.

Textual notes: Masoretic text and Septuagint

The Hebrew text (MT) and the Greek version of the Septuagint (LXX) diverge at significant points, marked here in the orthodox column. At v. 1 the MT reads Adonài («the Lord»), not the proper Name, which will appear only in vv. 3, 5, and 12; the LXX renders uniformly kýrios, flattening the distinction. At v. 2 the MT places the serafìm «above him» (mimmà'al lo), while the LXX places them «around him» (kýklō). At v. 6 the seraph «flies» (vayyà'af) in the MT, but «is sent» (apestálē) in the LXX. At v. 13 the MT preserves the clause «holy seed is its stump» (zèra qòdesh matzavtàh), absent in the LXX, which ends with the image of the felled tree alone: this is the textual foundation of the theology of the «remnant». The targumic tradition (Targum Jonathan), to avoid anthropomorphism, does not say that Isaiah «saw the Lord» but that he «saw his glory» — a caution that, as we shall see, the New Testament takes up in a different key.

Jewish reception: the Qedushàh and the heavenly council

The triple Qadòsh, qadòsh, qadòsh (v. 3) has become the nucleus of the Qedushàh, the liturgical sanctification of the Name recited in communal prayer: the triple repetition expresses the supreme and absolute degree of divine holiness, not an enumeration. The halakhic tradition discusses its recitation, which requires the presence of the assembly (cf. Tosefta Berakhot; b. Kiddushin 31a). The plural in v. 8 — «who will go for us?» (lanu) — is read as the heavenly council, the court of messengers surrounding the throne, and not as a plurality of divine subjects: it is the same «let us make» of Gn 1,26 read in its sense of royal deliberation. The rabbinic tradition also questions the fact that Isaiah «saw the King»: in b. Yevamot 49b the vision of Isaiah is compared with that of Moses (cf. Ex 33,20: «no human being can see me and live»), distinguishing the degrees of prophetic perception — Moses through a «clear lens», the other prophets through a «dim lens».

Aggadah: the serafìm, the coal, the hardening

The six wings of each seraph are read according to three functions: two cover the face (one cannot gaze directly upon the divine glory), two cover the feet — a euphemism for the lower parts, a sign of modesty before the Holy One — and two serve for flight, that is, for service. The serafìm, «the burning ones», belong to the highest order of the heavenly court. The glowing coal taken with tongs from the altar (vv. 6–7) purifies the prophet's lips with the fire of worship: atonement (kippùr) precedes commissioning, and the «unclean lips» of one who lives «in the midst of a people of unclean lips» express the prophet's solidarity with his people, not a detachment from them. The oracle of hardening (vv. 9–10) is discussed in the tannaitic halakhic midrash — Mekhilta DeRabbi Yishmael, Bachodesh 1:17 — and connected by tradition to the theme of return: the verse indeed closes with «we-shav... and be healed», where the root shuv is that of the teshuvàh, repentance-return. The hardening, therefore, is not an irrevocable destiny but the diagnosis of a deafness that remains reversible.

New Testament reception and typology

The oracle of hardening (Is 6,9–10) is the passage from the Old Testament most frequently cited in the Gospels with regard to incomprehension: Jesus takes it up before the crowds (Mt 13,14-15; Mk 4,12; Lk 8,10), John uses it as a seal on the public ministry (Jn 12,40), and Paul applies it to Israel at the end of Acts (Ac 28,26-27) and in Rm 11,8, within the discourse on the «remnant» and the partial and temporary hardening. Decisive is Jn 12,41: «Isaiah said this because he saw his glory, and spoke of him» — referring to the glory of Christ. Where the Targum had said «the glory of the Lord» out of caution, the fourth Gospel identifies that glory with the glory of the Word: the Christian tradition thus reads the throne vision as a Christophany, a manifestation of the pre-incarnate Word, the Angel-Lord who already in the Old Testament makes the divine glory present.

Observance and liturgy: the Sanctus and the teshuvàh

From v. 3 two parallel and lasting liturgical uses derive. In Jewish prayer, the Qedushàh takes up «Holy, Holy, Holy» in the communal repetition of the Amidah, making the praying assembly an echo of the choir of the serafìm. In Christian liturgy, the same verse has entered as the Sanctus (the Trisagion) at the heart of the eucharistic anaphora, where the Church sings with «the angels and the serafìm». The practical dimension of the pericope is therefore not a new halakhic command, but an act of worship: joining the song of the serafìm in the sanctification of the Name, and doing so within the assembly. To this is linked the appeal to teshuvàh implicit in v. 10 and developed by tradition (cf. b. Megillah 17b, on the order of the blessings of the Amidah «knowledge → return → forgiveness»): hardening is not the final word, because the «holy seed» (v. 13) preserves, in the stump of the felled tree, the possibility of return and the renewal of the people.