The prophet here addresses those whose professions of allegiance to Jehovah are hollow (Isaiah 46:8), and who in the land of exile had in their hearts apostatised: cp. Isaiah 42:17. Come.. waters] i.e. are descended from Judah (Psalms 68:26).
3-5. Events of their history had been foretold by Jehovah long before they happened, lest in their perversity they should attribute them to their false gods.
6-8. But now the things Jehovah purposes are declared on the eve of the event, lest in their presumption they should say that they knew them before.