Charles Ellicott Commentary Ezekiel 35:15

"As thou didst rejoice over the inheritance of the house of Israel, because it was desolate, so will I do unto thee: thou shalt be desolate, O mount Seir, and all Edom, even all of it; and they shall know that I am Jehovah." — Ezekiel 35:15 (ASV)

Because it was desolate. This is spoken of Israel; yet Israel was to preserve a remnant who should return to their land, and ultimately become the centre of the new covenant. So the desolation of Edom, though ultimately perpetual as far as its nationality is concerned, is not inconsistent with the fact foretold by Amos (Amos 9:12), that a remnant even of Edom should at last be received into the Church.

All Idumea. It is better to keep the uniform name of Edom. Idumea is essentially the same country but is a more modern name, and when it came into use the boundaries had somewhat changed.