מלאכי א:ג פירוש: רש״י

And I hated Esau to push him off to a land because of Jacob, his brother. Now it is customary in the world that, if one has two sons, he selects a beautiful portion for the firstborn.

and I made his mountains desolate They do not compare to the mountains of Israel.

for the jackals of the desert A den of jackals.