John Chrysostom
During the reign of Jehoiakim, son of Josiah, the prophetic words of Jeremiah came forth. This introduction serves to highlight the kings during whose rule he delivered his messages. The phrase, "And it came to pass in the days of Jehoiakim the son of Josiah," confirms that Jeremiah was indeed a prophet, bestowed with spiritual favor during Josiah's reign. However, he began speaking the prophetic truths particularly under Jehoiakim, as there was a pressing need for spiritual encouragement at that time. If the author intended to indicate solely the period when Jeremiah commenced his prophetic ministry, it would have sufficed to mention Josiah alone. Yet, to reference the other monarchs he prophesied under, it was essential to include them as well. This highlights that while Jeremiah’s prophetic ministry began during Josiah's time, there was less urgency for strong admonitions then, given that the king was righteous and the people were faithful to him.