Jesaja 6:6

This confession was followed by the forgiveness of his sins, of which he received an attestation through a heavenly sacrament, and which was conveyed to him through the medium of a seraphic absolution. "And one of the seraphim flew to me with a red-hot coal in his hand, which he had taken with the tongs from the altar. And he touched my mouth with it, and said, Behold, this hath touched thy lips, and thine iniquity is taken away; and so thy sin is expiated." One of the beings hovering round the Lord (there were, therefore, a large and indefinite number) flew to the altar of incense - the heavenly original of the altar of incense in the earthly temple, which was reckoned as belonging to the Most Holy Place - and took from this altar a ritzpâh, i.e., either a red-hot stone (Vulg. Calculum, Ar. radfe or radafe), or, according to the prevailing tradition, a red-hot coal (vid., râtzēph -râshaph, to scatter sparks, sparkle, or glow: syn. gacheleth), and that with a pair of tongs, because even a seraph's hand cannot touch the vessels consecrated to God, or the sacrifices that belong to Him. With this red-hot coal he flew to Isaiah, and having touched his mouth with it, i.e., that member of his body of whose uncleanness he had more especially complained (cf., Jer 1:9, where the prophet's mouth is touched by Jehovah's hand, and made eloquent in consequence), he assured him of the forgiveness of his sins, which coincided with the application of this sacramental sign. The Vav connects together what is affirmed by nâga‛ (hath touched) and sâr (a taker away) as being simultaneous; the zeh (this) points as a neuter to the red-hot coal. The future tecuppâr is a future consec., separated by Vav conversive for the purpose of bringing the subject into greater prominence; as it is…

Hitherto, it should seem, Isaiah had prophesied as a candidate, having only a virtual and tacit commission; but here we have him (if I may so speak) solemnly ordained and set apart to the prophetic office by a more express or explicit commission, as his work grew more upon his hands: or perhaps, having seen little success of his ministry, he began to think of giving it up; and therefore God saw fit to renew his commission here in this chapter, in such a manner as might excite and encourage his zeal and industry in the execution of it, though he seemed to labour in vain. In this chapter we have, I. A very awful vision which Isaiah saw of the glory of God (Isa 6:1-4), the terror it put him into (Isa 6:5), and the relief given him against that terror by an assurance of the pardon of his sins (Isa 6:6, Isa 6:7). II. A very awful commission which Isaiah received to go as a prophet, in God's name (v. 8), by his preaching to harden the impenitent in sin and ripen them for ruin (v. 9-12) yet with a reservation of mercy for a remnant, (v. 13). And it was as to an evangelical prophet that these things were shown him and said to him.