The message to king Ahaz is that the two militant kings of Syria and Remaliah might have decided to come against Judah to set up their own puppet king. The comforting prophetic declaration is that “it shall not stand, neither shall it come to pass.” That had to have been extremely comforting to a king facing a possible invasion.
Not only will it not come to pass, but within sixty-five years Ephraim would not even be a separate people.