Zephaniah 2:9 (BSB)

Therefore, as surely as I live,” declares the LORD of Hosts, the God of Israel, “surely Moab will be like Sodom and the Ammonites like Gomorrah—a place of weeds and salt pits, a perpetual wasteland. The remnant of My people will plunder them; the remainder of My nation will dispossess them.”

From Zephaniah 2. Also in the ESV.

Commentary on Zephaniah 2:9

• John Calvin (Reformed), Calvin's Commentaries on Zephaniah 2:9: In order to cheer the miserable Jews by some consolation, God said, in what we considered yesterday, that the wantonness of Moab was known to him; he now adds, that he would visit with punishment the reproaches which had been mentioned. For it would have availed them but little that their wrongs had been observed by God, if no punishment had been prepared.
• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Zephaniah 2:8-11: The Moabites and Ammonites were both of the posterity of Lot; their countries joined, and, both adjoining to Israel, they are here put together in the prophecy against them. I. They are both charged with the same crime, and that was reproaching and reviling the people of God and triumphing in their calamities (Zep 2:8): They have reproached my people; while God's people kept close...
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Zephaniah 2:9: Therefore [as] I live, saith the Lord of hosts, the God of Israel The Lord here swears by himself, by his life; partly to show how provoked he was at, and how grievously he resented, the injuries done to his people; and partly to observe the certain fulfilment of what is after declared; and it might be depended upon it would surely be done, not...
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Zephaniah 2:9: the breeding of nettles--or, the overspreading of nettles, that is, a place overrun with them. salt pits--found at the south of the Dead Sea. The water overflows in the spring, and salt is left by the evaporation. Salt land is barren (Jdg 9:45; Psa 107:34, Margin). possess them--that is, their land; in retribution for their having occupied Judah's land.