The word which Isaiah the son of Amoz saw concerning Judah and Jerusalem. (Isaiah 2:1 NASB).
Chapters two through five apparently make up the 2nd prophecy of the book of Isaiah. These are probably not in chronological order. It is possible that this prophecy was delivered after the destruction of the Northern King of Israel in 722 BC because it is sent only to Judah and Jerusalem, but that is just a hypothesis.