John Gill Commentary Zephaniah 2:10

"This shall they have for their pride, because they have reproached and magnified themselves against the people of Jehovah of hosts." — Zephaniah 2:10 (ASV)

This shall they have for their pride
This calamity shall come upon their land, the land of the Moabites and Ammonites, for their pride, which often goes before a fall; and has frequently been the cause of the ruin of kingdoms and states, and of particular persons; and indeed seems to have been the first sin of the apostate angels, and of fallen man. Of the pride of Moab see (Isaiah 16:6) :

because they have reproached and magnified [themselves] against the
people of the Lord of hosts ;
they looked with disdain upon them, as greatly below them; and spoke contemptibly of them, of their nation, and religion; and "made" themselves "great", and set up themselves "above" them, opened their mouths wide, and gave their tongues great liberties in blaspheming and reviling them: what was done to them is taken by the Lord as done to himself; see (Jeremiah 48:42) .