Jeremiah 25:1

The word that came to Jeremiah concerning all the people of Judah in the fourth year of Jehoiakim the son of Josiah king of Judah, that was the first year of Nebuchadrezzar king of Babylon;

Fourth year of Jehoiakim - called the year in . But probably Jehoiakim was set on the throne by Pharaoh-necho on his return from Carchemish about July, whereas Nebuchadnezzar mounted the throne January 21, 604 BC; so that Nebuchadnezzar's first year was partly the third, partly the fourth of Jehoiakim. Here first Jeremiah gives specific dates. Nebuchadnezzar had previously entered Judea in the reign of his father Nabopolassar.