Zephaniah 2:8

Nay, God not only takes notice of, but interests himself in the reproaches cast on his people, because they are his; and it is certain that those who look with disdain upon the people of the Lord of hosts thereby dishonour the Lord of hosts himself. See this very thing charged on Moab and Ammon, Ezek. xxv. They are both laid under the same doom.

I have heard the reproach of Moab, and the revilings of the children of Ammon,....

Thus the old serpent spits his venom; and pride is at the bottom of it; it is in their pride that they have magnified themselves against the people of the Lord of hosts, thinking themselves as good as they, as great, and every way as happy. It is the comtempt of the proud that God's people are filled with, Ps. cxxiii.

I have heard the reproach of Moab - God punished them for the cruel part they had taken in the persecutions of the Jews; for when they lay under the displeasure of God, these nations insulted them in the most provoking manner. See on Amo 1:13 (note), and Gen 19:25 (note); Deu 29:23 (note); Isa 13:19 (note); Isa 34:13 (note); Jer 49:18 (note); Jer 50:40 (note).

I - Dionysius: “God, Who know all things, “I heard” that is, have known within Me, in My mind, not anew but from eternity, and now I shew in effect that I know it; wherefore I say that I hear, because I act after the manner of one who perceiveth something anew.” I, the just Judge, heard (see Isa 16:6; Jer 48:39; Eze 35:12-13). He was present and “heard,” even when, because He avenged not, He seemed not to hear, but laid it up in store with Him to avenge in the due time Deu 32:34-35. The reproach of Moab and the reviling of the children of Ammon, whereby they have reproached My people - Both words, “reproached, reviled,” mean, primarily, cutting speeches; both are intensive, and are used of blaspheming God as unable to help His people, or reviling His people as forsaken by Him. If directed against man, they are directed against God through man. So David interpreted the taunt of Goliah, “reviled the armies of the living God” (1Sa 17:26, 1Sa 17:36, 1Sa 17:45, coll. 10. 25), and the Philistine cursed David “by his gods” 1Sa 17:43. In a Psalm David complains, “the reproaches of them that reproached Thee are fallen upon me” (Psa 69:10 (9)); and a Psalm which cannot be later than David, since it declares the national innocency from idolatry, connects with their defeats, the voice of him “that reproacheth and blasphemeth” (Psa 44:16 (17), joining the two words used here). The sons of Corah say, “with a sword in my bones, mine enemies reproach me, while they say daily unto me, where is thy God?” Psa 42:10. So Asaph, “The enemy hath reproached, the foolish people hath blasphemed Thy Name” Psa 74:10, Psa 74:18; and, “we are become a reproach to our neighbors. Wherefore should the pagan say, where is their God? render unto our neighbors - the reproach wherewith they have reproached Thee, O Lord” Psa 79:4, Psa 79:10, Psa 79:12. […]