There is a Medrash in Shmos Rabboh (12:3) and in Medrash Tanchumah (Voeira 15) that both state: And Hashem said to Moshe: "place your hand upon the heavens." Thus, it is written: "all Hashem desired, he has done." (Tehilim 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 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." (Shemos 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." (Tehilim 135:6). At Matan Torah that decree that separated the spiritual from the material world was rescinded. Now there could be a complete unity between the upper spiritual beings and the lower beings through the Torah which was given to bring peace on to the world. Peace between the spiritual retinue from above and the worldly retinue from below. This means that now physical objects can be permeated with holiness and sanctified.
