Isaiah

Exodus 12

I remember hearing somewhere a comment made that the Lord would smite all the gods of Egypt, and that the wonders sent among the nation were things that their gods were specifically in control over, according to their beliefs. Destroying the faith of their idols. There was a purpose to each plague, and they were chosen specifically.

Egypt will have a temple to the Lord.

If there is free movement between the two nations (Egypt and Assyria), that means a few things. For one, there is some peace and stability in the land, that they can freely move between the two. It would also imply that there is a working infrastructure (highways) – the nations are not lying in rubble. Finally, if they are in service, doing good works, then that means that their lives are stable and settled – they have the means and time to be able to do community and/or ecclesiastical work. Also, they are tolerant of other nations and lands (Assyria, who they were usually at work with), meaning they have learned some sense of unity.

The conversion of Egypt will be so complete that the Lord mentions them in comparison to Israel. The same for Assyria