כִּֽי־תֹאמַ֨ר אֱד֜וֹם רֻשַּׁ֗שְׁנוּ וְנָשׁוּב֙ וְנִבְנֶ֣ה חֳרָב֔וֹת כֹּ֤ה אָמַר֙ יְהוָ֣ה צְבָא֔וֹת הֵ֥מָּה יִבְנ֖וּ וַאֲנִ֣י אֶהֱר֑וֹס וְקָרְא֤וּ לָהֶם֙ גְּב֣וּל רִשְׁעָ֔ה וְהָעָ֛ם אֲשֶׁר־זָעַ֥ם יְהוָ֖ה עַד־עוֹלָֽם׃
Cuando Edom dijere: Nos hemos empobrecido, mas tornemos á edificar lo arruinado; así ha dicho SEÑOR de los ejércitos: Ellos edificarán, y yo destruiré: y les llamarán Provincia de impiedad, y, Pueblo contra quien SEÑOR se airó para siempre.
Rashi
Should Edom say, “We were poor” And if Edom says, “At first we were poor, but from now on we will be rich from the spoils of Jerusalem.” but we will return and build the ruins Our ruins, so said the Lord, etc.
Tze'enah Ure'enah
“If Esau says, we are shattered, etc.” [1:4]. If Esau will say, we were poor before, but now we have become rich from plunder that we robbed from the city of Jerusalem, and with it we will build our city that was devastated. However, the Holy One said, they will build and I will tear down and devastate what they will build. They are called evildoers. I have commanded Israel that they should not harm Edom, as the verse says, “you shall not abhor an Edomite” [Deuteronomy 23:8]. You should not abhor an Edomite. Those Edomites who are just should also have compassion for Israel. However, they have done everything bad to Israel and rejoiced over the destruction of Jerusalem. They are called a nation that angers God forever.3Radak, Malachi, 1:4.