Albert Barnes' Notes on the Whole Bible - Isaiah 43:25
I, even I, am he - This verse contains a gracious assurance that their sins would be blotted out, and the reason why it would be done. The pronoun ‘I’ is repeated to make it emphatic, as in Isaiah 43:11. Perhaps also God designs to show them the evil of the sins which are mentioned in the previous verses, by the assurance that they were committed against him who alone could forgive, and who had promised them pardon. The passage also reminds them, that it was God alone who could pardon the sins... read more
The Pulpit Commentary - Isaiah 43:26
Put me in remembrance . Either, ironically, "Remind me of thy good deeds; plead thy cause with me on that ground; show the merits that justify thee;" or else seriously, "Remind me of my promises; plead them before me; declare them, that by my free grace I may justify thee." The latter is the more probable interpretation. read more