John Calvin 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. He now shows for whose benefit he had foretold these things about the Egyptians and Ethiopians. It was in order that the Jews might learn amidst their afflictions to hope in God, and might not have recourse to foreign aid, which the Lord had forbidden.