Jeremiah: Judah has abandoned her covenant with God. God has sent several prophets to speak to the people warning them that just as Israel (the Northern Kingdom) was carried away for their sin so will be Judah. The promise is that while Judah will go to Babylon their release is also promised after 70 years. Read Deuteronomy 31 and 32 to see what Moses had to say about it.
Gospel: John 9:18-41
New Testament: Romans 10:1-13
Old Testament: Jeremiah 25:8-17