What does Isaiah 16:13 mean?
This suggests that some of what Isaiah has written about future judgement on Moab was not new information. Some form or version of this prediction may have been given already. We don't know whether that means that parts of the oracle existed before Isaiah was born, or that he himself wrote It. We do know that Jeremiah 48 includes some of this same prophecy about this judgement on Moab. It is possible that both used and revised an existing oracle under the inspiration of the Lord.Isaiah will say in the next verse that he does have new information about the oracle from the Lord. This judgement will come to pass in three years' time (Isaiah 16:14).