Midrash su Salmi 135:6

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.

Another interpretation: It should not have said: FROM THE HEAVENS, but "From the earth," because their bread customarily comes up only from the earth.⁶⁸See Tanh., Exod. 4:20; cf. Exod. R. 25:2. But this text is related (to Ps. 135:6): WHATEVER THE LORD DESIRES HE DOES…. When he wished <to do so>, he divided the sea before Israel and made it dry land; and when he wished <to do so> he made it a sea. The custom of heaven is to bring down dew and rain and for the earth to bring forth bread, as stated (in Job 28:5): AS FOR THE EARTH, OUT OF IT COMES FORTH BREAD. But when he wished <to do so>, he brought down the bread from the heavens, as stated (in Exod. 16:4): BEHOLD, I WILL RAIN DOWN BREAD < FROM THE HEAVENS> FOR YOU…. And the dew goes up from the earth, as stated (in Exod. 16:14): WHEN THE LAYER OF DEW HAD GONE UP. This text is related (to II Chron. 12:8): NEVERTHELESS, THEY SHALL BE {MY} [HIS] SERVANTS…. But they were not servants to Nebuchadnezzar, as stated (in Dan. 1:6): NOW AMONG THOSE FROM THE CHILDREN OF JUDAH WERE DANIEL, < HANANIAH, MISHAEL, AND AZARIAH >…. What did he do for them? (Vs. 5): THE KING APPOINTED FOR THEM [A DAILY PORTION]…. But when you brought down manna for them, it came down just as the rain comes down, for there was no limit to it. Thus (according to Exod. 16:4) I rained DOWN [BREAD FROM THE HEAVENS FOR YOU].