As thou didst rejoice at the inheritance of the house of Israel, because it was desolate,.... So Edom rejoiced at the destruction of Jerusalem, Obadiah 1:12, and so the followers of the man of sin will rejoice at the slaying of the witnesses, Revelation 11:10, which is resented by the Lord, and therefore adds,
so will I do unto thee; make thee desolate, as is explained in the next clause:
thou shall be desolate, O Mount Seir, and all Idumea, even all of it; not that mount only, but all the land of Edom, called Idumea; the destruction shall be general, as it was, and irretrievable; and so not Rome only, but all the antichristian states, will be destroyed, when God comes forth in his wrath against them:
and they shall know that I am the Lord; the Lord God omniscient and omnipotent; who, having foretold all this, shall accomplish it.