Now, although the Egyptian magicians also brought up frogs upon the land of Egypt through the help of demons, Pharaoh nevertheless declared himself ready to let the people go, to sacrifice unto the Lord. The difference between this plague and the first was, that water turned into blood had not caused him any personal inconvenience, while the swarms of frogs inflicted physical suffering, and he gave the promise to Moses to let Israel go, in the hope of ridding himself of the pain he experienced.
And Moses in turn promised to entreat God for him on the following day. It could not be done at once, because the seven days' term had not yet elapsed. The prayer offered by Moses in behalf of Pharaoh was granted, all the frogs perished, and their destruction was too swift for them to retire to the water. Consequently the whole land was filled with the stench from the decaying frogs, for they had been so numerous that every man of the Egyptians gathered together four heaps of them.
Although the frogs had filled all the market-places and stables and dwellings, they retreated before the Hebrews as if they had been able to distinguish between the two nations, and had known which of them it was proper to abuse, and which to treat with consideration. Beside sparing the Hebrews in the land of Egypt, the frogs kept within the limits of the land, in no wise trenching upon the territory of the neighboring nations.
Indeed, they were the means of settling peaceably an old boundary dispute between Egypt and Ethiopia. Wherever they appeared, so far extended the Egyptian domain; all beyond their line belonged to Ethiopia.