Continuing our exposition of the Immanuel prophecy, God now calls upon Isaiah to prophecy again concerning the sign of Maher-Shalal-Hash-Baz. Through this Word, God not only assures Judah that the Syro-Ephraim coalition will fail, but also calls Judah to respond in faith. If they turn to Assyria in place of God, Assyria will be like a wild river which they will not be able to control, bringing destruction upon them.