"Jeremiah ... was one of the major prophets of the Hebrew Bible (Christian Old Testament)," according to Wikipedia. "Jeremiah is traditionally credited with authoring the Book of Jeremiah, the Books of Kings and the Book of Lamentations, with the assistance and under the editorship of Baruch ben Neriah, his scribe and disciple.
"Judaism considers the Book of Jeremiah part of its canon, and regards Jeremiah as the second of the major prophets.
Christianity also regards Jeremiah as a prophet and he is quoted in the New Testament. Islam too considers Jeremiah a prophet, and he is listed as a major prophet in Ibn Kathir's Qisas Al-Anbiya (Stories of the Prophets).
"About a year after King Josiah of Judah had turned the nation toward repentance from the widespread idolatrous practices of his father and grandfather, Jeremiah's sole purpose was to reveal the sins of the people and explain the reason for the impending disaster (destruction by the Babylonian army and captivity). ..."