מדרש אויף שמות 9:12

וַיְחַזֵּ֤ק יְהוָה֙ אֶת־לֵ֣ב פַּרְעֹ֔ה וְלֹ֥א שָׁמַ֖ע אֲלֵהֶ֑ם כַּאֲשֶׁ֛ר דִּבֶּ֥ר יְהוָ֖ה אֶל־מֹשֶֽׁה׃ (ס)

אָבער גאָט האָט פֿעסט געמאַכט פַּרעהס האַרץ, און ער האָט ניט צוגעהערט צו זײ; אַזױ װי גאָט האָט גערעדט צו משהן.

Midrash Tanchuma Buber

(Numb. 14:11:)1This supplement comes from Codex Vaticanus, Ebr. 34. It is found neither in Buber’s primary Oxford manuscript nor in the traditional version of the Tanhuma. THEN THE LORD SAID UNTO MOSES: HOW LONG WILL THIS PEOPLE SCORN ME, AND HOW LONG WILL THEY HAVE NO FAITH IN ME …? This text is related (to Prov. 1:25, 30): BUT YOU HAVE SPURNED ALL MY PLAN AND WOULD NOT ACCEPT MY REBUKE [….] THEY HAVE DESPISED ALL MY REBUKE. What is the implication of BUT YOU HAVE SPURNED ALL MY PLAN? Simply that all the good which I planned for you, you have spoiled and spurned.2Numb. R. 16:24. Thus it is stated (in Prov. 1:25): BUT YOU HAVE SPURNED (rt.: PR') ALL MY PLAN? At the beginning I said to Moses (in Exod. 3:8): I HAVE COME DOWN TO DELIVER THEM OUT OF THE HAND OF THE EGYPTIANS AND TO BRING THEM UP <OUT OF THAT LAND UNTO A GOOD AND SPACIOUS LAND>…. But you did not act in the way <I intended>. Instead you came to the sea and immediately spoiled my plan, as stated (in Ps. 106:7): THEY REBELLED AT THE SEA, AT THE REED SEA. When you came to Mount Sinai, I descended and spoke with you. I brought down on your behalf thousands upon thousands and myriads upon myriads of angels, and I passed on two angels to each and every person in Israel. R. Johanan said: One to gird him with his weapons3Gk.: zone (“girdle”). and one to put a crown on his head.4Above, Exod. 2:9 and 8:7 (with the notes in those sections); also Lam. R. 2:13 (17); Cant. R. 4:4:1 PRK 16:3; PR 21:7; 33:10; M. Ps. 103:8. R. Huna of Sepphoris said: He bound their weapons to them, while R. Simoy said: He clothed them in purple, as stated (in Ezek. 16:10): I CLOTHED YOU WITH EMBROIDERED GARMENTS. R. Simeon b. Johay says: He clothed them with an instrument of weaponry with the Ineffable Name written upon it. Moreover, as long as it was in their hand, nothing evil had power against them, neither the angel of death nor anything else.5See above, Exod. 9:12; Exod. R. 32:1; 41:7; 51:8; Lev. R. 18:3; cf. ‘AZ 5a. But when they sinned, Moses had said to them (in Exod. 33:5): NOW THEN, REMOVE YOUR ORNAMENTS (i.e., your weapons) FROM YOURSELVES, THAT I MAY KNOW WHAT TO DO TO YOU. At that time (according to vs. 4): WHEN THE PEOPLE HEARD THIS BAD NEWS, THEY WENT INTO MOURNING, <AND NO ONE PUT HIS ORNAMENTS ON HIMSELF>. And what is written (in vs. 6)? SO [THE CHILDREN OF] ISRAEL STRIPPED THEMSELVES OF ORNAMENTS…. What had the Holy One done (at the giving of Torah)?6See Exod. R. 32:1. He had brought the angel of death and said to him: All the world is under your authority, except this people whom I have chosen for myself. R. Eleazar the Son of R. Jose the Galilean said: The angel of death said to the Holy One: Have I been created in the world for nothing?7Exod. R. 27. The Holy One said to him: I created you so that you would destroy <all> the peoples of the world except this people, over whom you have no authority to take a single one of them. Look at the plan which the Holy One had devised concerning them for them to live and endure! Thus it is stated (in Deut. 4:4): BUT YOU WHO CLUNG TO THE LORD YOUR GOD ARE ALL ALIVE TODAY. So also it says (in Exod. 32:16): AND THE WRITING WAS THE WRITING OF GOD INSCRIBED (harut) ON THE TABLETS. What is the meaning of harut? R. Judah says: FREEDOM (herut) from the empires; but R. Nehemiah says: FREEDOM (herut) from the angel of death; and our masters say: FREEDOM from afflictions. Look at the plan which the Holy One had devised for them! Then they immediately spoiled this plan after <only> forty days. It is therefore stated (in Prov. 1:25): BUT YOU HAVE SPURNED ALL MY PLAN.
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Midrash Tanchuma Buber

Similarly you say (in Ps. 50:7): HEARKEN, O MY PEOPLE, AND LET ME SPEAK, O ISRAEL, SO THAT I MAY ADMONISH YOU: I AM GOD, YOUR GOD. When Israel stood at Mount Sinai (according to Exod. 24:7): THEY SAID: ALL THAT THE LORD HAS SPOKEN WE WILL CARRY OUT AND OBEY. R. Johanan said: Sixty myriads of angels came down and put crowns on their heads.60Below, Exod. 8:7; Numb. 4a:1; PR 10:6; 21:7; 29/30A(from MS Parma, 197a-198a):3; 33:10; M. Pss. 103:8; also Septuagint, Deut. 33:2 and Ps. 67:18; Josephus, Ant. 15:136; Acts 7:38, 53; Hebrews 2:2; but cf. Galatians 3:19, according to which these angels lessened the importance of the giving of Torah. R. Simay said: He clothed them in purple.61Gk.: porphyra or porphyrion. Rav Huna of Sepphoris said: He girded them with girdles.62Gk.: zonai. R. Simeon said: They gave them weapons. The great name was inscribed on them; and, as long as it was in their hands, the angel of death was unable to prevail over them.63Cf. Mekhilta de Rabbi Ishmael, Bahodesh 9; AZ 5a. Thus it is stated (in Exod. 32:16): INSCRIBED ON THE TABLETS. What is the meaning of INSCRIBED (HRWT)? R. Judah says: Freedom (HRWT) from the empires.64Avot 6:2; ARN, A, 2:3; ‘Erub. 54a; PRE 46; below, 9:12; Tanh., Numb. 4:13 [12]; Exod. R. 32:1; 41:7; 51:8; Lev. R. 18:3; Numb. R. 10:8; 16:24; Cant. 8:6:2. R. Pinhas bar Hama the Priest said in the name of R. Johanan, <who spoke > in the name of R. Eleazar the Son of R. Jose [the Galilean]: <The Holy One said:>65On these added words, see Midrash Tanhuma (Jerusalem: Eshkol, n.d.), vol. 1, appendix, p. 92, n.5. If the angel of death should come and say to me: Why was I created, I should say to him: Surely I created you to be over the nations of the world and not over my children. Why? Because I made them gods, as stated (in Ps. 82:6): I SAID: YOU ARE GODS; EVEN ALL OF YOU ARE CHILDREN OF THE MOST HIGH. Therefore, when he came to give them the commandments, he said to them: Heed what I am saying to you. For this reason it is stated (in Ps. 50:7) HEARKEN, O MY PEOPLE, AND LET ME SPEAK, O ISRAEL, SO THAT I MAY ADMONISH YOU: I AM GOD, YOUR GOD. See, the Holy One said to Moses here: Although I made you a god, I am <still> your God. You are a god only to Pharaoh. It is so stated (in Exod. 7:1): SEE, I HAVE SET YOU AS A GOD TO PHARAOH.
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Shemot Rabbah

“They took soot of the furnace, and stood before Pharaoh; and Moses threw it heavenward; and it became boils erupting into blisters upon man and upon beast” (Exodus 9:10).
“They took soot of the furnace…erupting [pore’aḥ]…upon man and upon beast” – what is pore’aḥ? It is that they were afflicted with leprosy along with it, as it is stated: “If the leprosy will erupt [paro’aḥ tifraḥ] [in the skin]” (Leviticus 13:12).
“The magicians could not stand before Moses because of the boils, as the boils were upon the magicians, and upon all the Egyptians” (Exodus 9:11).

“The magicians could not…” – why could they not stand before Moses? It is because they counseled Pharaoh to cast every son that is born into the Nile, so that Moses would die.9See Shemot Rabba 1:24. Moreover, they condemned him to death because he removed the crown from Pharaoh’s head and placed it on his head.10See Shemot Rabba 1:26. Therefore, “the magicians could not [stand before Moses because of the boils, as the boils were upon the magicians].”
“The Lord hardened the heart of Pharaoh, and he did not heed them; as the Lord had spoken to Moses” (Exodus 9:12).
“The Lord hardened the heart of Pharaoh” – when the Holy One blessed be He saw that he did not relent from the first five plagues, from that point on, the Holy One blessed be He said: Even if he wishes to repent, I will harden his heart so that I may exact his entire punishment against him; “as the Lord had spoken to Moses” – as it is written: “But I will harden Pharaoh’s heart” (Exodus 7:3).
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