v1-2: See 9.15-16; the influence of bad leaders; they issued oppressive decrees, and unjust laws, favouring the rich, and making the poor, particularly, suffer. Their authority was bolstered by false prophets (9.15).
v3-4: The Lord will judge those who mistreat others. They might avoid justice, and promote injustice, but they could never escape from God's judgment.
v5-6: Words directed to Assyria, to v19. Assyria was used by God to judge unbelieving Israel, see 8.3-4.
v7: Yet Assyria was ignorant of this calling. His only purpose was one of destruction and expansion. It is in the power of God to use the works of the wicked for the blessing of His people, and His own glory.
v8: Assyria's military commanders, he claimed, were kings.
v9-11: See 36.19; 37.3, referring to past victories. He expected to defeat Jerusalem in the same way, 36.18-20, thinking that Jerusalem depended on some local deity, rather than on Almighty God.
v12: Judgment would therefore fall upon Assyria for his pride, "Woe to the Assyrian," v5.
v13-14: Assyria attributed his victories to his own strength, speaking about himself, "I...me...my"
v15: Assyria was the rod of the Lord's anger, and would not be allowed to exalt itself above the Lord.
v16-19: Judgment would come as a fire kindled in the midst of the nation. The once mighty nation would become weak and fall. The image is of a forest fire, leaving just a few trees standing.
v20-23: Words addressed to Israel, as the prophet prophesied that Israel would learn its lessons. Israel had previously trusted in Assyria (2 Kings 15.19-20), but that had gained him nothing, since Assyria soon returned to defeat Israel.
A remnant returned (2 Chr 30.11), trusting in God. They had enjoyed prosperity as a populous nation, but were now reduced to a small remnant. This was no accident of history, but the hand of God upon His own people. The remnant will return; in Hebrew Shear Jashub, the name of Isaiah's son, 7.3.
v24-25: The section, v24-34 describes Assyria's then future attack on Judah, see chapters 36-39.
Words now addressed to Judah, "my people who live in Zion", the next nation in Assyria's sights. The rod of Assyria was at God's command (v5), and the removal of that rod was also at God's command. Judah was warned here, but also reminded that the rod would be removed, and Assyria itself destroyed.
v26-27: The yoke imposed by Assyria would also be removed. Their defeat provided relief for Judah. God had defeated other nations, Midian and Egypt, and could destroy Assyria too.
v28-32: The journey of the Assyrian army to Jerusalem. On arrival at Jerusalem, they "shake their fist," threatening to attack the city. See 36.1-2, where the arrival of the Assyria army at Jerusalem is described.
v33-34: The Lord Himself will break off the boughs, felling the lofty trees, humbling the pride of Assyria. Sennacherib himself was killed, 2 Kings 19.36-37.