Midrasz do Sędziów 5:4

"And God spoke to Moses in the Sinai Wilderness" (Numbers 1:1). Why the Sinai Wilderness? From here the sages taught that the Torah was given through three things: fire, water, and wilderness. How do we know it was given through fire? From Exodus 19:18: "And Mount Sinai was all in smoke as God had come down upon it in fire." How do we know it was given through water? As it says in Judges 5:4, "The heavens dripped and the clouds dripped water [at Sinai]." How do we know it was given through wilderness? [As it says above,] "And God spoke to Moses in the Sinai Wilderness." And why was the Torah given through these three things? Just as [fire, water, and wilderness] are free to all the inhabitants of the world, so too are the words of Torah free to them, as it says in Isaiah 55:1, "Oh, all who are thirsty, come for water... even if you have no money." Another explanation: "And God spoke to Moses in the Sinai Wilderness" — Anyone who does not make themselves ownerless like the wilderness cannot acquire the wisdom and the Torah. Therefore it says, "the Sinai Wilderness."

“It is the sound of my beloved knocking” – by means of Moses when he said: “Moses said: So said the Lord: At about midnight, I will emerge in the midst of Egypt” (Exodus 11:4). “Open for me” – Rabbi Yasa said: The Holy One blessed be He said to Israel: My children, open for Me one opening of repentance like the eye of the needle, and I will open for you openings that wagons and carriages enter through it.
Rabbi Tanḥuma, Rabbi Ḥunya, and Rabbi Abbahu [said] in the name of Reish Lakish: It is written: “Desist, and know that I am God…” (Psalms 46:11) – the Holy One blessed be He said to Israel: Desist from your evil actions and know that I am God. Rabbi Levi said: Were Israel to repent even one day, they would be redeemed immediately and the son of David would come immediately. What is the reason? “For He is our God, and we are the people of His flock and the sheep under His hand; today, if you heed His voice” (Psalms 95:7). Rabbi Yudan and Rabbi Levi say: The Holy One blessed be He said to Israel: Desist from your wicked actions and repent in the blink of an eye, “and know that I am God.”¹⁵Earnest repentance, even for a very short time, will lead to redemption, which will itself cause widespread recognition of God.
“My sister [aḥoti]” – as they were stitched [nitaḥu] to Me in Egypt with the blood of the paschal offering and the blood of circumcision. That is what is written: “I passed you and saw you wallowing in your blood, and I said to you, in your blood you shall live” (Ezekiel 16:6) – this is the blood of the paschal offering. “I said to you, in your blood you shall live” – this is the blood of circumcision (Ezekiel 16:6).
“My love [rayati]” – as they fell in love [sheriu] with Me at the sea and said: “This is my God and I will exalt Him” (Exodus 15:2), “the Lord will reign for ever and ever” (Exodus 15:18). “My dove” – at Mara, as from there they were commanded and became distinctive through all the mitzvot, acts of charity, and good deeds, like the dove that is distinctive.¹⁶A dove recognizes its mate, distinguishing it from among the other doves. That is what is written: “There He instituted for it statutes and ordinances” (Exodus 15:25). “My faultless [tamati]” – My wholehearted ones [tamuti], as they were wholehearted with Me at Sinai, and said: “Everything that the Lord said, we will perform and we will heed” (Exodus 24:7).
Rabbi Yannai said: My twin [teomati], as it were; I am not greater than it and it is not greater that I am.¹⁷God is as assiduous regarding the honor of the righteous of Israel as He is of His own honor. Rabbi Yehoshua of Sikhnin [said] in the name of Rabbi Levi: My twin [teomati], just as with twins, if one has a headache his counterpart feels it. So too, as it were, the Holy One blessed be He says: “I am with him in times of trouble” (Psalms 91:15).
“For my head is filled with dew” – on the basis of: “The earth quaked, the heavens dripped” (Psalms 68:9). “My locks, drops of night” – on the basis of what is stated: “The clouds dripped water” (Judges 5:4).

Variantly: "I am the L rd your G d": When the Holy One Blessed be He arose and proclaimed "I am the L rd your G d," the earth took ill, as it is written (Judges 5:4) "O L rd, when You came forth from Seir, when You strode from the field of Edom, the earth shook; the heavens, too, dripped," and (Ibid. 5) "Mountains dripped before the L rd," and (Psalms 29:4) "The voice of the L rd in strength; the voice of the L rd in glory!" … (Ibid. 9) "And in His sanctuary all proclaim "'Glory!'" Until their houses were suffused with the splendor of the Shechinah… And it was for this reason that the nations of the world were solicited (to accept the Torah.) So as not to give them a pretext vis-à-vis the Shechinah — to say: Had we been solicited, we would have accepted it. They were solicited and did not accept it! As it is written (Devarim 33:2) "And he said: L rd came from Sinai, etc." He came and revealed Himself to the sons of the wicked Esav and asked them: Will you accept the Torah? They: What is written in it? He: "You shall not kill." They: But this is what we have inherited from our father, as it is written (Genesis 27:40) "By your sword shall you live!" He revealed Himself to the sons of Ammon and Moav and asked them: Will you accept the Torah? They: What is written in it? He: "You shall not commit adultery." They: But we are all the sons of incest, as it is written (Genesis 19:36) "And the two daughters of Lot conceived by their father." How, then, shall we accept it? He came and revealed Himself to the sons of Ishmael and asked them: Will you accept the Torah? They: What is written in it? He: "You shall not steal." They: But this is the blessing by which our father was blessed, as it is written (Genesis 16:12) "And he (Ishmael) shall be a brutish man, etc." And when He came to Israel (Devarim 32:2), "in His right hand, the fire of the Law for them," they all opened their mouths and cried (Exodus 24:7) "All that the L rd says, we shall do and we shall hear!" And thus is it written (Habakkuk 3:6) "He stood and measured the land; He looked and dispersed the nations." R. Shimon b. Elazar said: If the sons of Noach could not abide by the seven mitzvoth commanded them, how much more so (could they not abide) by all the mitzvoth of the Torah! An analogy: A king appoints two caretakers, one over stores of grain, and one over stores of silver and gold. The first bridles at not having been appointed over the stores of silver and gold, and the second says to him: Empty one, if you were faithless with grain, how much more so with silver and gold! If the sons of Noach could not abide by seven mitzvoth alone, how much more so (could they not abide by the six hundred and thirteen mitzvoth (of the Torah)! Why was the Torah not given in Eretz Yisrael? So as not to provide a pretext to the nations of the world, viz.: Because it was not given in our land, that is why we did not accept it. Variantly: So as not to rouse contention among the tribes, one saying, it was given in my land; the other: it was given in my land. That is why it was given in the open desert. In three settings was the Torah given — desert, fire, and water. Just as these are free for all, so, Torah.