Exodus 8:10 And he said, To morrow. And he said, Be it according to thy word: that thou mayest know that there is none like unto the Lord our God. 11 And the frogs shall depart from thee, and from thy houses, and from thy servants, and from thy people; they shall remain in the river only.
[Patriarchs & Prophets pp 266] The plague, however, continued till the time specified, when throughout all Egypt the frogs died, but their putrid bodies, which remained, polluted the atmosphere. The Lord could have caused them to return to dust in a moment; but He did not do this lest after their removal the king and his people should pronounce it the result of sorcery or enchantment, like the work of the magicians. The frogs died, and were then gathered together in heaps.
Here the king and all Egypt had evidence which their vain philosophy could not gainsay, that this work was not accomplished by magic, but was a judgment from the God of heaven. “When Pharaoh saw that there was respite, he hardened his heart.” At the command of God, Aaron stretched out his hand, and the dust of the earth became lice throughout all the land of Egypt. Pharaoh called upon the magicians to do the same, but they could not. The work of God was thus shown to be superior to that of Satan.
The magicians themselves acknowledged, “This is the finger of God.” But the king was still unmoved. Appeal and warning were ineffectual, and another judgment was inflicted. The time of its occurrence was foretold, that it might not be said to have come by chance. Flies filled the houses and swarmed upon the ground, so that “the land was corrupted by reason of the swarms of flies.” These flies were large and venomous, and their bite was extremely painful to man and beast. As had been foretold, this visitation did not extend to the land of Goshen.
Exodus 8:24 And the Lord did so; and there came a grievous swarm of flies into the house of Pharaoh, and into his servants' houses, and into all the land of Egypt: the land was corrupted by reason of the swarm of flies.
May The Lord add His blessing to the study of His word. God bless!