3. He must likewise assure them that the iniquity of their family, if they persisted in it, would be the ruin of their family, though it was a royal family (v. 5): If you will not hear, will not obey, this house shall become a desolation, the palace of the kings of Judah shall fare no better than other habitations in Jerusalem. Sin has often been the ruin of royal palaces, though ever so stately, ever so strong. This sentence is ratified by an oath: I swear by myself (and God can swear by no greater, Heb. vi. 13) that this house shall be laid in ruins. Note, Sin will be the ruin of the houses of princes as well as of mean men.