John Gill Commentary Ezekiel 30:8

"And they shall know at I am Jehovah, when I have set a fire in Egypt, and all her helpers are destroyed." — Ezekiel 30:8 (ASV)

And they shall know that I am the Lord The Egyptians shall know the Lord to be the true God, and acknowledge him to be omniscient and omnipotent, that should so exactly foretell their destruction, and accomplish it:

when I have set a fire in Egypt : a war there; the heat of battle, very devouring and consuming, as well as very grievous and terrible, as fire is. The Targum is, ``when I shall give (or set) people that are strong as fire against Egypt;'' the army of the Chaldeans:

and when all her helpers shall be destroyed ; her auxiliaries, the neighbouring nations in alliance with them, before mentioned.