In the fifth year of Jehoiakim the son of Josiah, king of Judah, in the ninth month, all the people in Jerusalem and all the people who came from the cities of Judah to Jerusalem proclaimed a fast before the LORD.
Here is added a fuller explanation; for the Prophet relates nothing new, but according to what is common in Hebrew he expresses at large what he had before briefly stated: for he had said, that Baruch read in the Temple the words of God as he had been commanded; but he now relates when and how this was done, even in the fifth year of...
It should seem that Baruch had been frequently reading out of the book, to all companies that would give him the hearing, before the most solemn reading of it altogether which is here spoken of; for the directions were given about it in the fourth year of Jehoiakim, whereas this was done in the fifth year, Jer 36:9.
Commenting on Jeremiah 36:9-19
And it came to pass in the fifth year of Jehoiakim the son of Josiah king of Judah, in the ninth month,.... This was a different time of reading the book from the former, enjoined by the prophet, and performed by Baruch, Jer 36:6; that was on the tenth day of the seventh month, in the fourth year of Jehoiakim; this was in the fifth...