They were all ashamed - That is, all the legates or ambassadors. When they came into Egypt, they found them either unwilling to enter into an alliance, or unable to render them any aid, and they were ashamed that they had sought their assistance rather than depend on God (compare Jeremiah 2:36).
Related Commentaries of Isaiah 30:5
Isaiah 30:5
5 They were all ashamed of a people that could not profit them, nor be an help nor profit, but a shame, and also a reproach.