Carl Friedrich Keil and Franz Delitzsch Old Testament Commentary

The address now closes by holding up once more the object and warrant of faith. "I am Jehovah; and beside me there is no Savour. I have proclaimed and brought salvation, and given to perceive, and there was no other god among you: and ye are my witnesses, saith Jehovah, and I am God. Even from the day onwards I am so; and there is no deliverer out of my hand: I act, and who can turn it back?" The proper name "Jehovah" is used here (Isa 43:13) as a name indicating essence: "I and no other am the absolutely existing and living One," i.e., He who proves His existence by His acts, and indeed by His saving acts. מושׁיע and Jehovah are kindred epithets here; just as in the New Testament the name Jehovah sets, as it were, but only to rise again in the name Jesus, in which it is historically fulfilled. Jehovah's previous self-manifestation in history furnished a pledge of the coming redemption. The two synonyms הגּדתּי and השׁמעתּ have הושׁעתּי in the midst. He proclaimed salvation, brought salvation, and in the new afflictions was still ever preaching salvation, without there having been any zâr, i.e., any strange or other god in Israel (Deu 32:16; see above, Isa 17:10), who proved his existence in any such way, or, in fact, gave any sign of existence at all. This they must themselves confess; and therefore (Vav in sense equivalent to ergo, as in Isa 40:18, Isa 40:25) He, and He alone, is El, the absolutely mighty One, i.e., God. And from this time forth He is so, i.e., He, and He only, displays divine nature and divine life. There is no reason for taking מיּום in the sense of יום מהיות, "from the period when the day, i.e., time, existed" (as the lxx, Jerome, Stier, etc., render it). Both the gam (also) and the future 'eph‛al (I will work) require the meaning supported by Eze 48:35, "from the day onwards," i.e., from this time forth (syn. לפני־יום, Isa 48:7). The concluding words give them to understand, that the predicted salvation is coming in the way of judgment. Jehovah will go forward with His work; and if He who is the same yesterday and today sets this before Him, who can turn it back, so that it shall remain unaccomplished? The prophecy dies away, like the massâ' Bâbhel with its epilogue in Isa 14:27. In the first half (Isaiah 42:1-17) Jehovah introduced His servant, the medium of salvation, and proclaimed the approaching work of salvation, at which all the world had reason to rejoice. The second half (Isaiah 42:18-43:13) began with reproaching, and sought to bring Israel through this predicted salvation to reflect upon itself, and also upon its God, the One God, to whom there was no equal.