Jeremiah 48:13

We may see more clearly from this verse, that the Prophet does not so much address the Moabites as his own people; for he was not a teacher to the Moabites to promote their safety; on the contrary, he intended his doctrine for the benefit of the Jews, as in the present instance.

Ashamed, he says, shall Moab be of his idol: for we have said that Chemosh was the god of the Moabites, as every nation had its own peculiar god, even its own invention. Now, the comparison made here shews that the Prophet wished to exhort the people, to whom he was appointed a teacher, to repentance; for he set before them the example of the ten tribes. And we know that at the time Jeremiah announced this prophecy, the kingdom of Israel was destroyed. All the Israelites, then, had been driven into exile except the tribe of Judah and the half tribe of Benjamin. Now, the ten tribes, as it is well known, had, under Jeroboam, departed from the pure worship of God, and had built for themselves an altar in Bethel. Hence, then, the Prophet now says, As ashamed were the Israelites of their superstitions, which they had devised for themselves, so a similar vengeance of God awaited the people of Moab; and thus he shews to the Jews what it is to trust in the only true God. The Jews were not, indeed, involved in so gross a superstition as to worship idols, at least publicly; but Ezekiel shews that they also were contaminated with this kind of pollution, and that the very sanctuary was defiled with idols; and at the same time the worship of God, according to the Law, continued to be celebrated. But the Jews had nothing but the external form: they had, indeed, the temple and the altar, they professed to worship the true God, but in the meantime impiety and contempt of true religion prevailed among them, and they had begun to involve themselves in many ungodly superstitions, as we have before seen.