Are men, and not God; and therefore utterly unable to defend you, either without or against my will. Their horses flesh; weak and frail, as that word signifies, Psalms 78:39 Hebrews 5:7, and elsewhere. Not spirit; not like spiritual substances, such as the angels, who are immortal, and invisible by men; whereof we have instances, Exodus 12:29,30 Isa 37:36.
Related Commentaries of Isaiah 31:3
Isaiah 31:3
3 Now the Egyptians are men, and not God; and their horses flesh, and not spirit. When the LORD shall stretch out his hand, both he that helpeth shall fall, and he that is holpen shall fall down, and they all shall fail together.