Isaiah 6:8

“Also I heard the voice of the Lord, &c.] The Targum renders it, the voice of the Word of the Lord, as if it was the second Person, the Word, that was heard speaking; but it seems rather to be the voice of the first Person, the Father: saying, Whom shall I send? to the people of Israel, to reprove them for their blindness and stupidity, and to threaten them, and foretell unto them their ruin and destruction; intimating that it was a difficult thing to pitch upon a proper person; and that there were but few that were fit to go on such an errand: this is spoken after the manner of men; otherwise the Lord knew whom to send, and whom he would send; and could easily qualify anyone he pleased, and…”

“I . . . us--The change of number indicates the Trinity (compare Gen 1:26; Gen 11:7). Though not a sure argument for the doctrine, for the plural may indicate merely majesty, it accords with that truth proved elsewhere. Whom . . . who--implying that few would be willing to bear the self-denial which the delivering of such an unwelcome message to the Jews would require on the part of the messenger (compare Ch1 29:5). Here am I--prompt zeal, now that he has been specially qualified for it (Isa 6:7; compare Sa1 3:10-11; Act 9:6).”

“The voice of the Lord - Hebrew: “The voice of Yahweh.” He had before been addressed by one of the seraphim. Whom shall I send, and who will go for us? - The change of number here, from the singular to the plural, is very remarkable. Jerome, on this place, says that it indicates the ‘sacrament’ of the Trinity. The Septuagint renders it, ‘whom shall I send, and who will go to this people?’ The Chaldee, ‘whom shall I send to prophesy, and who will go to teach?’ The Syriac, ‘whom shall I send, and who will go?’ The Arabic has followed the Septuagint. The use of the plural pronouns “we and us,” as applicable to God, occurs several times in the Old Testament. Thus, Genesis 1:26 : ‘And God said,…”

“Who - To deliver the following message. The change of the number, I and us, is very remarkable; and both being meant of one and the same Lord, do sufficiently intimate a plurality of persons in the Godhead. Isaiah 6:9”

“6:8 Who will go for us? The Lord spoke in the presence of his angels, the heavenly council (see also 1 Kgs 22:19-22; Jer 23:18, 22). • Here I am: The prophet was so overcome by the grace of God in cleansing him that he willingly committed himself to a lifetime of ministry.”

“I heard: Gen 3:8-10; Deu 4:33-36; Eze 1:24, Eze 10:5; Act 28:25-28 Whom: Exo 4:10-13; Kg1 22:20; Act 22:21, Act 26:16, Act 26:17 us: Gen 1:26, Gen 3:22, Gen 11:7 Then: Mat 4:20-22; Act 20:24; Eph 3:8 Here am I: Heb. Behold me, Isa 65:1 Isaiah 6:9”

“When Isaiah had been thus absolved, the true object of the heavenly scene was made apparent."Then I heard the voice of the Lord, saying, Whom shall I send, and who will go for us? Then I said, Behold me here; send me!" The plural "for us" (lânu) is not to be accounted for on the ground that, in a case of reflection or self-consultation, the subject also stands as the object in antithesis to itself (as Hitzig supposes); nor is it a pluralis majestatis, as Knobel maintains; nor is the original abstract signification of the plural hinted at, as Meier thinks. The plural is no doubt used here with reference to the seraphim, who formed, together with the Lord, one deliberative council (sōd…”