What does Isaiah 22:5 mean?
Isaiah's prophecy against Jerusalem has taken the form of scolding the people for celebrating. Citizens of Jerusalem need to carefully understand what has happened to them—or what will happen—at the hand of the Lord. Scholars say Isaiah is referring to either the Assyrian failed siege of Jerusalem in 701 BC, or the Babylonian successful destruction of the city in 586 BC (Isaiah 22:1–3).His reaction to the city full of celebration is strong (Isaiah 22:4). The jubilance taking place in the city of Jerusalem is inappropriate: it's either cluelessness to the coming terror, or the people are overlooking the pain suffered despite their rescue. Now Isaiah reminds the people of another horror. He describes the invaders arriving to tear down the walls and their shouts echoing off the surrounding mountains. Confusion, chaos, and terror would grip the people inside.
Ultimately, the prophet says, that day is the work of the Lord, not of the enemy. The Lord God is the one who causes it to happen. In Judah's case, He brings about that day in answer to their own faithlessness to Him.