Midrasch zu Schemot 9:22

Whatever the Egyptians devised against Israel, [the Holy One] brought against them. Those < Egyptians > devised for them to draw their water. What is written (in Ps. 78:44)? HE TURNED THEIR NILES INTO BLOOD SO THAT THEIR STREAMS WERE UNDRINKABLE. Those < Egyptians > devised for them to be laden as traveling traders.²²Gk.: pragmateutes. He sent frogs upon them and covered them with resin. Those < Egyptians > devised for them to work on the land. The Holy One made the land swarm with gnats. Those <Egyptians> devised that they should bear their children as a paidagogos.²³The Greek word designates a slave who was assigned to a child as an attendant and guardian. He sent lions, wolves, and bears among them. <If> an Egyptian had ten children, when he told Israel to bring them to the market place, the lion came and took one, the wolf one, the bear one, the leopard one, and the snake one. Then he came <back> to the Egyptian alone. The Egyptian said: Where are my children? Israel said to him: Sit down and I myself will render you an accounting: The lion took one <etc.>; and so <he continued> on, until he had given him an accounting. Now they (the Egyptians) devised that they would tend their livestock, but he sent out the plague among them, as stated (in Exod. 9:6): THEN ALL THE EGYPTIAN LIVESTOCK DIED. They intended that they would be bath attendants {bathe them}. He brought the boils upon them. They intended to stone them with stones. The Holy One brought the hail upon them, as stated (in Exod. 9:22): THAT THERE MAY BE HAIL <IN ALL THE LAND OF EGYPT >…. They intended that they would be their vine dressers. The Holy One brought the locusts, who ate their trees, as stated (in Exod. 10:15): AND THEY ATE ALL THE GRASS OF THE EARTH…. They intended to imprison them in prison. The Holy One brought darkness upon them, as stated (in Exod. 10:23): THEY COULD NOT SEE ONE ANOTHER…. They intended to kill them. The Holy One killed their first-born, as stated (in Exod. 12:29): THAT THE LORD SMOTE ALL THE FIRST-BORN. They intended to drown them in water. The Holy One also drowned them in water, as stated (in Ps. 136:15): BUT OVERTHREW PHARAOH AND HIS HOST IN THE REED SEA….

And Hashem said to Moshe: "place your hand upon the heavens." Thus it is written: "all Hashem desired, he has done." (Psalms 135:6) Dovid said: this is in spite of the Holy One's decree that "the heavens are Hashem's heavens and the earth He gave to humanity." (Ibid. 115:16) To what analogy is this similar? To a king who decrees, saying "Romans shall not descend to Syria and Syrians shall not ascend to Rome." Likewise, when the Holy One created the universe, He decreed, saying: "the heavens are Hashem's heavens and the earth He gave to humanity." (Ibid.) When He desired to give the Torah He nullified this original decree. He said: "the the lower [realms] shall ascend to the higher, and the higher shall descend to the lower; and I am the one who initiated [this]." As it is written: "And Hashem descended upon Mt. Sinai." (Exodus 19:20) And it is written: "And to Moshe He said 'ascend to Hashem'." (Ibid. 24:9) Behold, [it is for this reason that it is written] "all which Hashem desired in the heavens and upon earth, he has done." (Psalms 135:6) ...

And the Lord said unto Moses: “Stretch forth thy hand toward heaven that there may be hail” (Exod. 9:22). Scripture says (elsewhere in allusion to this verse): Whatsoever the Lord pleased, that hath He done, in heaven and in the earth (Ps. 135:6). In reference to the heaven, the Holy One, blessed be He, said: The heavens are the heavens of the Lord (Ps. 115:16), and in regard to the earth, The earth hath He given to the children of men (ibid.). This may be compared to a king who decreed that the people of Rome should not migrate to Syria and that the people of Syria should not migrate to Rome. And similarly, the Holy One, blessed be He, decreed when he created the world: The heavens are the heavens of the Lord; and the earth He hath given to the children of men. However, when He decided to give the Torah, He abrogated the first decrees and declared: Let the earthly beings ascend on high and the heavenly creatures descend below, and I will be the first (to do so), as it is said: And the Lord came down upon Sinai (Exod. 19:20). And it is also written: And to Moses He said: “Come up unto the Lord” (ibid. 24:1). Hence, Whatsoever the Lord pleased, that hath He done.