The Letter of Jeremiah , also known as the Epistle of Jeremy . This is a deuterocanonical ( or apocryphal ) book of the Old Testament . The Letter of Jeremiah , also known as the Epistle of Jeremy , is a deuterocanonical book of the Old Testament ; this letter purports to have been written by Jeremiah to the Jews who were about to be carried away as captives to Babylon by Nebuchadnezzar .