Luke 3:1–18 introduces John the Baptist as God’s prophetic voice in a time of political power and spiritual corruption, calling Israel to repentance in preparation for the Lord’s coming. John announces that true repentance bears fruit in concrete acts of justice, generosity, and faithfulness, confronting both complacency and religious pride. His message climaxes in hope: the coming One will bring both judgment and salvation, baptizing not merely with water but with the Holy Spirit and fire.