All who had Hebrew slaves had made an agreement with Zedekiah and had set them free. But afterward they had taken the same fellows and made them slaves again. Jeremiah is very angry about this, and he says that they will be punished for doing this. Isn’t this just like Christians sometimes? The Lord Jesus has given us freedom from our sins and the world, and then we go back into the worldly things, and Satan attracts us into doing things that make us like slaves again.