48:14-47. The destruction of Moab is further prophesied, to awaken them by national repentance and reformation to prevent the trouble, or by a personal repentance and reformation to prepare for it. In reading this long roll of threatenings, and mediating on the terror, it will be of more use to us to keep in view the power of God's anger and the terror of his judgments, and to have our hearts possessed with a holy awe of God and of his wrath, than to search into all the figures and expressions here used. Yet it is not perpetual destruction. The chapter ends with a promise of their return out of captivity in the latter days. Even with Moabites God will not contend for ever, nor be always wroth. The Jews refer it to the days of the Messiah; then the captives of the Gentiles, under the yoke of sin and Satan, shall be brought back by Divine grace, which shall make them free indeed.

30. I know—Moab's "proud arrogancy" (Jer 48:29) or "wrath," against My people, is not unknown to Me.

it shall not be so—The result shall not be so as he thinks: his lies shall not so effect what he aims at by them. Calvin translates, "his lies are not right (that is, his vauntings are vain because God will not give them effect); they shall not do so" as they project in their minds, for God will set at naught their plans.