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15 When I shall make the land of Egypt desolate, and the country shall be destitute of that whereof it was full, when I shall smite all them that dwell therein, then shall they know that I am the LORD.
'Edom' or 'Idumea,' as in Isaiah 34:5, signifies people who are in evil and falsities derived there.
(Odkazy: The Inner Meaning of the Prophets and Psalms 34)
5 For my sword shall be bathed in heaven: behold, it shall come down upon Idumea, and upon the people of my curse, to judgment.