In the first four chapters, Judah’s sins are confronted. We are told that God can relent no longer and that judgment is coming. Isaiah chapter 5 ends this section with a song of heartache that describes Judah’s unfaithfulness to God. After this introductory section, that is arranged almost like a lawsuit that God levels on his people, is an account of Isaiah’s encounter with God and his call to prophesy to Judah.