Jeremiah, known as the 'weeping prophet,' served in Jerusalem during its destruction by the Babylonians and faced severe persecution, including imprisonment and attempts on his life. He delivered prophecies regarding Judah's exile, predicting a 70-year captivity, and spoke of future restoration and the coming of the Messiah. Through his experiences, Jeremiah emphasized fidelity to God's word, illustrated by the example of the Rechabites, who remained faithful to their ancestral commands.