Charles Ellicott Commentary Jeremiah 25:3

"From the thirteenth year of Josiah the son of Amon, king of Judah, even unto this day, these three and twenty years, the word of Jehovah hath come unto me, and I have spoken unto you, rising up early and speaking; but ye have not hearkened." — Jeremiah 25:3 (ASV)

The twenty-third year (B.C. 603-4) — Thus, there had been nineteen years of prophetic work under Josiah, and between three and four under Jehoiakim (Jeremiah 1:2). Of the former period, we have only a scanty record. The year is noticeable as the one that apparently witnessed the first collection of Jeremiah’s prophetic utterances (Jeremiah 36:5–8).

Rising early and speaking — See Note on Jeremiah 7:13.