Midrash su Esodo 9:19

... This is that which is written (Job 36:22), "See, God is beyond reach in His power, who governs like Him?" It is customary in the world that when flesh and blood seeks to do bad to his enemy, he does so immediately so that [the other] not become aware. But the Holy One, blessed be He, warns Pharaoh about each and every plague, so that he would repent. This is that which is written (7:17), "In this you will know that I am the Lord"; (7:27) "behold I will plague all of your borders with frogs"; (9:19) "send, hasten your cattle."

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) ...

(Exod. 32:1:) WHEN THE PEOPLE SAW THAT MOSES WAS LATE <IN COMING DOWN FROM THE MOUNTAIN >. What is the meaning of WAS LATE (boshesh)?³⁹Shab. 89a; Gen. R. 18:6; Exod. R. 41:7; cf. PR 11:12. <That> six (shesh) hours had passed (bo) without Moses having come down, for Moses had made an agreement with them and said to them: After forty days I will bring you the Law. As soon as six hours had passed and he had not come down, immediately (ibid., cont.): THE PEOPLE GATHERED TOGETHER AGAINST AARON. Our masters have said: Satan came, confounded the world,⁴⁰See also Tanh., Exod. 9:19. and showed them something like Moses suspended from the earth, i.e., in the air⁴¹Avir; cf. Gk.: aer. beneath it.⁴²Cf. the parallel in Exod. R. 41:7, which reads, “suspended between heaven and earth.” Then they pointed a finger at him and said (ibid., cont.): <ARISE AND MAKE A GOD FOR US WHO WILL GO BEFORE US, > FOR THIS IS THE MAN, MOSES.⁴³The biblical context would suggest the following translation: FOR REGARDING THIS MAN MOSES <WHO BROUGHT US UP FROM THE LAND OF EGYPT, WE DO NOT KNOW WHAT HAS BECOME OF HIM >. At that time Hur said to them: O stiff-necked < people >, do you not remember what he did for you?⁴⁴Lev. R. 10:3. According to Exod. 24:14, Moses left Aaron and Hur in charge while he was up on the mountain. They arose and killed him.⁴⁵Below, Exod. 10:4; Exod. R. 41:7; 42:1; 48:3; Numb. R. 9:45. Then they gathered together against Aaron, as stated (ibid.): THE PEOPLE GATHERED TOGETHER AGAINST AARON….⁴⁶Sanh. 7a; Exod. R. 51:8. They said to him: If you make a god for us, well and good; but if not, we will do to you just as we did to Hur. (Exod. 32:5:) WHEN AARON SAW THIS, <i.e., when> he saw what they had done to Hur, (ibid., cont.) HE BUILT (YBN) AN ALTAR (MZBH), <i.e.> he understood (HBYN) from the slaughtered (MZBWH) one.⁴⁷So also Lev. R. 10:3; cf. Gen. R. 34:9, which gives the same interpretation of BUILT, in Gen. 8:20. They wanted to build <the altar> along with him. He said to them, leave me alone, and I will make it by myself, for no one is to build it along with me. Now Aaron had a plan. <He was> saying <to himself>: While I am building it, Moses will come down.⁴⁸So also Exod. R. 37:2. Immediately (in Exod. 32:6): SO THEY ROSE EARLY THE NEXT DAY, < OFFERED BURNT OFFERINGS, AND BROUGHT PEACE OFFERINGS>; [AND THE PEOPLE SAT DOWN TO EAT AND DRINK.] In every place that you find sitting, there you find degradation.⁴⁹Exod. R. 41:7; similarly Sanh. 106a; Gen. R. 38:7; Tanh., Gen. 9:1; Sifre, Numb. 131; PRE 47. Thus it is stated (in Gen. 37:25): THEN THEY SAT DOWN TO EAT BREAD. What degradation happened there? <It was there> that they sold Joseph. It is also written (in Numb. 25:1): WHILE ISRAEL WAS STAYING (literally: SITTING) AT SHITTIM. And what was the degradation there? (Ibid., cont.:) THE PEOPLE BEGAN TO GO WHORING <WITH THE DAUGHTERS OF MOAB>. And here too (in Exod. 32:6): THEN THE PEOPLE SAT DOWN, <i.e., in> the sitting of idolatry. The Holy One said to Moses; They have risen to revel in idolatry, while you are sitting <up here>. (Exod. 32:7:) GO AND GET DOWN. At that time Moses was going to go down, but he saw the angels of destruction and was afraid to go down. Thus it is stated (in Deut. 9:19): FOR I WAS AFRAID OF ANGER AND RAGE. What did he do? He went and grasped the throne, as stated (in Job 26:9): HE (Moses) GRASPS THE FACE OF A THRONE; [HE (the Holy One) SPREAD HIS CLOUD UPON HIM]. So the Holy One protected him and spread some of the radiance of his Divine Presence over him. Come and see how many troubles they caused. Yesterday Moses had shoved them (the angels of destruction) aside,⁵⁰According to Shab. 88b-89a and Exod. R. 28:1, because the angels wanted the Torah for themselves, they tried to prevent Moses from receiving it. and now he was afraid of them. (Deut. 9:19:) FOR I WAS AFRAID OF [ANGER AND RAGE]. The five angels of destruction were Af (Anger), Qetsef (Wrath), Meshabber (Smasher), Mashhit (Destroyer), and Hemah (Rage); ⁵¹Cf. Tanh., Exod. 9:20. Moses mentioned three patriarchs, and three <angels> went away.⁵²See also Exod. R. 44:1. But ANGER AND RAGE remained behind. Moses said to the Holy One: Sovereign of the World: You stand up to one and I to one, as stated (in Ps. 7:7 [6]): RISE UP, O LORD, IN YOUR Af (ANGER).⁵³A more traditional translation would be: RISE UP, O LORD IN YOUR ANGER. The Holy One said to him (in Exod. 32:7): GO AND GET DOWN; you have a descent (i.e., degradation). He said to him: Why? HE SAID TO HIM: BECAUSE YOUR PEOPLE <WHOM YOU HAVE BROUGHT UP FROM THE LAND OF EGYPT > HAVE ACTED BASELY. Moses said to him: Now are they my people and not your people! (Exod. 32:12:) TURN BACK FROM YOUR WRATHFUL ANGER. R. Simeon ben Johay said: Moses did not move from praying until the Holy One was reconciled to them. The Holy One said: In this world you sinned against me because the evil drive was ordering you; but in the world to come I am rooting it out of you, as stated (in Ezek. 36:26): I WILL REMOVE THE HEART OF STONE FROM YOUR FLESH AND GIVE YOU A HEART OF FLESH.⁵⁴Below, Tanh. (Buber), Lev. 1:12; above, Tanh. (Buber), Gen. 1:40; Tanh., Exod. 9:19; Tanh., Lev. 1:6.