By a roll of a book is to be understood parchments, which anciently were their books, the art of binding books being not then known. The precept is for recording all the revelations he had from God for twenty-two years last past; for he began to prophesy in the thirteenth year of Josiah, who reigned one and thirty years, so as he prophesied eighteen years during Josiah's life, and this was the fourth year of the reign of Jehoiakim. God would have them recorded, that there might be a memorial of them, that so the truth of them might appear, when God should bring them to pass, the time of which now drew very near.
Related Commentaries of Jeremiah 36:2
Jeremiah 36:2
2 Take thee a roll of a book, and write therein all the words that I have spoken unto thee against Israel, and against Judah, and against all the nations, from the day I spake unto thee, from the days of Josiah, even unto this day.