1. Introduction
As chapter 7 was about Ahaz putting the faith in the wrong savior, chapter 8 is about putting the fear against the wrong people. God says the only person we should fear is Good Himself.
2. The sign: Maher-shalal-hash-baz (1-4)
God asked Isaiah to name his son "Maher-shalal-hash-baz" meaning "plunder speedeth; spoil hasteth". This refers to the imminent destruction to Israel and Aram by Assyria. This will happen before Isaiah's son is old enough to say "mother" or "father."
From history we know that Assyria attacked Aram and Israel between 734-732 BC. King Rezin was killed and Pekah replaced by Hoshea, who killed him. All this happened in less than 2 years from the writing of this prophecy. Eventually, Samaria fell to the Assyrians in another attack in 722 BC, ending the existence of Israel.
The contemporary of Isaiah, prophet Hosea of Israel, were also told to name his children as a sign against Israel. His daughter was named "Lo-ruhamah" meaning "not loved" , and his son "Lo-ammi" meaning "not my people." (Hosea 1:6-9). Am I glad my father is not a Jewish prophet!
3. The overwhelming flood: Assyria (5-8)
Because the people did not appreciate God's care for them (symbolised by the spring of Shiloah in Jerusalem), God will bring the mighty river of Assyrians which will sweep away Israel and it will overflow into Judah.
Unlike Israel, Judah will not be destroyed but Assyria will only "reach it's neck" (v8). 2 Kings 18:13 described the invasion against Judah 30 years down the road: "And in the fourteenth year of King Hezekiah, Sennacherib king of Assyria came up against all the fortified cities of Judah and took them."
Hezekiah barely survived and was able to keep Assyria from entering Jerusalem by buying favor from the Assyrian King, Sennacherib, with gold from the temple. However, it was God who caused the withdrawal of Sennacherib, by sending an angel to kill 185,000 of his men. (2 Kings 19:35)
4) Fear Only God (9-15)
God asked Isaiah not to walk and think in the ways of the people, and not to be afraid of they are afraid of (i.e. the wars). Today we are not facing wars, but we are preoccupied with what our world desires - more power, more money, more pleasure.
But none of these will matter. Once God has decided against a nation (or a person), there's nothing they can do to change it. "Take counsel together, but it will come to nothing; speak a word, but it will not stand, for God is with us." (v10)
But we are to fear God instead, and to honor him. It's God that is in control of what happens to Israel and Judah.
To those who fear Him, He is a sanctuary, but to those who rebel, He is a stone of stumbling and a rock of offense. (v14). This verse was attributed to Christ in 1 Peter 2:6-8.
5) Listen to God's Word (16-22)
Got asked Isaiah to bind up his testimony and to teach them to his disciples. The Word of the Lord was preserved for us, and we are to read them as what happened to Israel has a lesson for us at a national and at a personal basis. Today, many people are offended if you share with them the gospel. It is a "rock of offense." Yet, that's what God wants us to continue to do.
Isaiah responded that he will wait upon the Lord and hope in Him. Waiting upon the Lord is like a waiter waiting on a table. The idea is to standby to receive instructions and to obey it. (v17) This is where Isaiah's focus was going to be, not in the chaos around him or being preoccupied with power or money.
Isaiah's message is not just in what he recorded in pen, but he and his whole family is the testimony and represents God's message to the people. (v18)
Yet the people, especially the leaders, refuse to listen to him, but inquire the mediums and the necromancers. Because of that, they are not enlightened ("no dawn" v20). Everything looks gloomy and hopeless to them, and then they get angry at God for the miserable conditions.
Are we willing to "wait upon the Lord" and serve Him even in uncomfortable situations?