In this unique prophecy, Yirmiyahu discusses the breach of the covenant of Shabbat. While the Torah and other prophecies connect immorality with the destruction of Jerusalem, Yirmiyahu stresses the importance of the observation of Shabbat as a condition for the people's continued existence in their country due to its nature as a national covenant with a most public nature. This prophecy is compared the prophecy in chapter 7, as well as to the prophecies of the other prophets regarding Shabbat. 

Courtesy of the Virtual Beit Midrash, Yeshivat Har Etzion