Commentaries
21:28-32 The diviners of the Ammonites made false prophecies of victory. They would never recover their power, but in time would be wholly forgotten. Let us be thankful to be employed as instruments of mercy; let us use our understandings in doing good; and let us stand aloof from men who are only skilful to destroy.
30. Shall I cause it to return into his sheath—namely, without first destroying Ammon. Certainly not (Jer 47:6, 7). Others, as the Margin, less suitably read it imperatively, "Cause it to return," that is, after it has done the work appointed to it.
in the land of thy nativity—Ammon was not to be carried away captive as Judah, but to perish in his own land.