The Lord had told them over and over what they were supposed to do. Over and over they had ignored those commands.
Trying yet again, the Lord told Jeremiah: Here are your choices. Doing bad things results in disaster. But, if they repent, I'll forgive them.
Since Jeremiah himself was not allowed to enter the house of the Lord in Jerusalem, he commissioned Baruch to carry the message. "Write down all I have been told and read it in the hearing of all the people of Judah who have come to the house of the Lord."
Baruch did as he was told.
Questions that arise from reading this passage: How is God's word being communicated to us? Do we bother to repeat to anybody what we have learned?