What does Isaiah 8:5 mean?

The Lord instructs to Isaiah once more. In Isaiah chapter 6, Isaiah described how the Lord called him to serve as a prophet: God's messenger to the nation of Judah. That lifelong work looked like what is happening in this chapter. The Lord speaks to Isaiah when He is ready to reveal something to His people. From there, Isaiah faithfully delivers God's Word, likely both in spoken form and, in writing as we read it today.

This moment seems to comes some time, maybe a year or two, after the birth of Isaiah's prophecy-fulfilling son, Maher-shalal-hash-baz. This extended name means, "speeding to the plunder, hurrying to the spoil". The Lord will now warn Judah that the destructive power of the Assyrians will not be limited to their enemies. It will overflow its banks and swamp them, as well.