Albert Barnes Commentary Isaiah 20:5

"And they shall be dismayed and confounded, because of Ethiopia their expectation, and of Egypt their glory." — Isaiah 20:5 (ASV)

And they shall be afraid - The Jews, or the party or faction among the Jews, who were expecting aid from allied Ethiopia and Egypt. When they see them vanquished, they will anticipate a similar danger to themselves; and they will be ashamed that they ever confided in a people so incapable of aiding them, instead of trusting in the arm of God.

Egypt their glory - Their boast, as if Egypt was able to save them. The word rendered here ‘glory’ (תפארת tiph'ereth) properly means “ornament, praise, honor;” and then it may mean the “object” of glory, or that in which people boast or confide. That is its sense here (Isaiah 13:19; Zechariah 12:7).