The Moabites and the Ammonites were two peoples who were linked together, because both were fathered by Lot, and came through incestuous relations with his two daughters (Genesis 19:36-38). Both of these peoples had magnified themselves against Israel’s border, that is, they had contested the border and sought to enlarge their own territory.
‘To me belongeth vengeance, and recompence’ (Deuteronomy 32:35), or as Paul renders it, ‘Vengeance is mine; I will repay, saith the Lord’ (Romans 12:19). God has heard, and he does not forget what these hostile nations have done to his people, and he assures Judah he will never forget. Their reproach and revilings are still fresh in his mind. He does not forget from one generation to the next, even when those immediately affected pass from the scene. Past generations of the children of Israel may die without seeing his answer, but his love for his children and his deep sympathy with their suffering means that there will be a recompense.
Christian people are also assured that God does not forget. ‘Put thou my tears into thy bottle: are they not in thy book?’ (Psalm 56:8). Therefore the rejoicing of the wicked over the righteous when they have put them to death is premature (Revelation 11:10). The wicked have a greater foe to contend with than they ever realised. They miscalculate badly when they judge the strength of Israel’s God, by the meek and lowly response which they meet with in his persecuted children. In the meantime we join with the prophet in urging all to repent and take advantage of God’s underlying offer of mercy.