Isaiah 43:16-17

Thus saith the Lord— The prophet in these words confirms what he had advanced respecting the deliverance from Babylon, by the former deliverance which God had wrought for his people from Egypt; thus, from the view of the past, strengthening the faith and hope of believers in what was to come. Some, however, suppose that these words are a kind of preface to the following period, in which the new work of grace is foretold.