John Gill Commentary Jeremiah 36:3

"It may be that the house of Judah will hear all the evil which I purpose to do unto them; that they may return every man from his evil way; that I may forgive their iniquity and their sin." — Jeremiah 36:3 (ASV)

It may be that the house of Judah will hear all the evil which I purpose to do unto them Not that there was any uncertainty in God as to the knowledge of future events, any more than a change in his purposes: he had purposed to bring evil upon them, which purpose would not be disannulled; and he knew that the Jews would not hearken to the prediction of it, or be concerned about it, and repent of their sins, and reform; but this method he was pleased to take, as being, humanly speaking, a probable one to awaken their attention, and which would leave them inexcusable:

that they may return every man from his evil way ; repent of it, and reform:

that I may forgive their iniquity and their sin ; by not inflicting on them the punishment and ruin threatened: where repentance is, remission of sin is likewise, and both are the gifts of divine grace, when spiritual and evangelical.