2. walk—are now setting out, namely, their ambassadors (Isa 30:4).
Egypt—See on Isa 19:1; Isa 20:1.
Pharaoh—the generic name of the kings of Egypt, as Cæsar was at Rome. The word in Egyptian means "king" [Josephus, Antiquities, 8.6,2]. Phra, "the sun," was the hieroglyphic symbol and title of the king.
shadow—image from shelter against heat: protection (Ps 121:5, 6).