17:19 Judah kept not - Judah's idolatry and wickedness are here remembered, as an aggravation of the sin of the Israelites, which was not only evil in itself, but mischievous to their neighbour, who by their examples were instructed in their wicked arts, and provoked to an imitation of them.
17:7-23 Though the destruction of the kingdom of the ten tribes was but briefly related, it is in these verses largely commented upon, and the reasons of it given. It was destruction from the Almighty: the Assyrian was but the rod of his anger, Isa 10:5. Those that bring sin into a country or family, bring a plague into it, and will have to answer for all the mischief that follows. And vast as the outward wickedness of the world is, the secret sins, evil thoughts, desires, and purposes of mankind are much greater. There are outward sins which are marked by infamy; but ingratitude, neglect, and enmity to God, and the idolatry and impiety which proceed therefrom, are far more malignant. Without turning from every evil way, and keeping God's statutes, there can be no true godliness; but this must spring from belief of his testimony, as to wrath against all ungodliness and unrighteousness, and his mercy in Christ Jesus.