The former things are come to pass, and new things do I declare: as all things which I have formerly promised or foretold have exactly come to pass in their proper seasons, and not one of them failed, as was noted, Joshua 23:14; so you have great reason to believe that what I now promise, though it be new and strange to you, shall infallibly be accomplished. Before they spring forth I tell you of them, that when they come to pass, you may know that I am God, and that this is my work. Compare 1 Thessalonians 13:19.
Related Commentaries of Isaiah 42:9
Isaiah 42:9
9 Behold, the former things are come to pass, and new things do I declare: before they spring forth I tell you of them.