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. (PP 266.1) MC VC

“When Pharaoh saw that there was respite, he hardened his heart.” Exodus 8:15. 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.” Exodus 8:19. But the king was still unmoved. (PP 266.2) MC VC

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.” Exodus 8:24. 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. (PP 266.3) MC VC

Pharaoh now offered the Israelites permission to sacrifice in Egypt, but they refused to accept such conditions. “It is not meet,” said Moses; “lo, shall we sacrifice the abomination of the Egyptians before their eyes, and will they not stone us?” Exodus 8:26. The animals which the Hebrews would be required to sacrifice were among those regarded as sacred by the Egyptians; and such was the reverence in which these creatures were held, that to slay one, even accidentally, was a crime punishable with death. It would be impossible for the Hebrews to worship in Egypt without giving offense to their masters. Moses again proposed to go three days’ journey into the wilderness. The monarch consented, and begged the servants of God to entreat that the plague might be removed. They promised to do this, but warned him against dealing deceitfully with them. The plague was stayed, but the king’s heart had become hardened by persistent rebellion, and he still refused to yield. (PP 266.4) MC VC