30:1-19 The prophecy of the destruction of Egypt is very full. Those who take their lot with God's enemies, shall be with them in punishment. The king of Babylon and his army shall be instruments of this destruction. God often makes one wicked man a scourge to another. No place in the land of Egypt shall escape the fury of the Chaldeans. The Lord is known by the judgments he executes. Yet these are only present effects of the Divine displeasure, not worthy of our fear, compared with the wrath to come, from which Jesus delivers his people.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.