Isaiah 43:25

Since Israel has neither brought sacrifices, nor even offered prayer acceptable to Jehovah, He himself must take the initiative in the work of redemption, blotting out its transgressions "for his own sake." In accordance with O.T. analogies, the act of forgiveness is described simply as "not remembering" sin; but the actual working out of forgiveness in history calls into exercise the resources of Omnipotence; it includes all Jehovah's dealings with His people, His handing them over to the dominion of the heathen (Isaiah 43:28), and saving them again in His marvellous providence. The verse, moreover, contains only one half of the prophet's teaching about forgiveness; the other half is the process by which the people are brought to repentance, and this is the work of the Servant of the Lord, as described in ch. 53.