Les Nombres 15:41 Midrash : Bamidbar Rabbah & Sifrei Bamidbar

Another matter: “Then Israel sang” (Numbers 21:17) – this is one of three matters⁸⁵The third matter relates to the vanquishing of Siḥon, which is first mentioned in Numbers 21:21–24. that Moses said before the Holy One blessed be He, and He said to him: You have taught Me. He said before Him: ‘Master of the universe, from where do Israel know what they have done?⁸⁶Namely, from where could they have known that the golden calf was a sin. Did they not grow in Egypt, and all of Egypt are idolaters. When You gave the Torah, You did not give it to them, and they were not standing there, as it is stated: “The people stood at a distance” (Exodus 20:18), and You gave it only to me, as it is stated: “To Moses, He said: Ascend to the Lord” (Exodus 24:1). When You gave the commandments, You did not give them to them. You did not say: “I am the Lord your God [eloheikhem],”⁸⁷“Your” in the plural. but rather: “I am the Lord your God [elohekha]” (Exodus 20:2).⁸⁸“Your” in the singular. You said it to me. Did I, perhaps, sin?’ The Holy One blessed be He said to him: ‘As you live, you have spoken well. You have taught Me. From now on I will speak with the expression: “I am the Lord your God [eloheikhem].”’
The second, when the Holy One blessed be He said to him: “Reckoning the iniquity of the fathers upon children” (Exodus 34:7). Moses said: ‘Master of the universe, how many wicked men begot righteous men? Shall they be taking from the iniquities of their fathers? Teraḥ worshipped idols, and Abraham his son was righteous. Likewise, Hezekiah was righteous, and Aḥaz his father was wicked. Likewise, Yoshiya was righteous, and Amon his father was wicked. Is it appropriate for the righteous to be stricken for the iniquity of their fathers?’ The Holy One blessed be He said to him: ‘You have taught Me. As you live, I am voiding My words and fulfilling your words,’ as it is stated: “Fathers shall not be put to death for children, and children shall not be put to death for fathers” (Deuteronomy 24:16) – ‘and as you live, I will write them in your name,’ as it is stated: “As it is written in the book of the Torah of Moses that the Lord commanded, [saying: Fathers will not be put to death for children, and children will not be put to death for fathers]” (II Kings 14:6).
The third, when the Holy One blessed be He said to him: ‘Wage war with Siḥon even if he does not seek to wage with you; you provoke war with him,’ as it is stated: “Rise, and travel, and cross the Arnon ravine; [see, I have placed Siḥon king of Ḥeshbon, the Emorite, and his land in your hand; begin taking possession, and provoke war with him]” (Deuteronomy 2:24). But Moses did not do so; rather, what is written: “I sent messengers” (Deuteronomy 2:26). The Holy One blessed be He said to him: As you live, I am voiding My words and fulfilling your words, as it is stated: “When you approach a city to wage war against it, you shall call to it for peace” (Deuteronomy 20:10). When Siḥon did not accept, the Holy One blessed be He toppled him before them, as it is stated: “We smote him” (Deuteronomy 2:33).
Moreover, even those who concealed themselves in the caves to kill them, the Holy One blessed be He intimated to the mountain and it crushed them, as it is stated: “You broke the heads of crocodiles on the waters. [You] crushed the heads of leviathan” (Psalms 74:13–14). The folk proverb says: If you gave bread to a child, inform his mother. The Holy One blessed be He said: How will Israel know the good that I performed on their behalf? What did He do? He distanced the mountains from one another, and the streams in the ravines washed them out,⁸⁹The streams washed the remains out of the caves where they were located. as it is stated: “The outpouring of the ravines” (Numbers 21:15). Israel was passing and reciting song: “Then Israel sang” (Numbers 21:17). Israel said: ‘It is incumbent upon You to perform miracles on our behalf, and it is incumbent upon us to bless and laud Your name.’ “Salvation belongs to the Lord. Your blessing is upon Your people, Selah” (Psalms 3:9).
It was due to the water that the decree was issued against Moses, and he is not mentioned in the song. Moses said: Master of the universe, after all the miracles that You performed on their behalf, will I die at their hand? From the wilderness You gave them the Torah, as it is stated: “From the wilderness to Matana” (Numbers 21:18).⁹⁰Matana means gift, referring here to the Torah. And it became their heritage [naḥalu] under my guidance, as it is stated: “And from Matana to Naḥaliel” (Numbers 21:19) – God became their heritage [naḥalu El]. And once it became their heritage, You decreed death upon me,” as it is stated: “From Naḥaliel to Bamot” (Numbers 21:19) – from the ravine [naḥal] came [ba] death [mot]. “And from Bamot to the canyon that is in the field of Moav” (Numbers 21:20), as it is stated: “He buried him in the canyon in the land of Moav” (Deuteronomy 34:6). Job said: “Who does not show favor to princes and does not prefer the wealthy over the poor, as they are all His handiwork” (Job 34:19).

R. Nathan said: There is no mitzvah in the Torah whose reward is not "at its side." Go and learn this from the mitzvah of tzitzith. There was once a certain man who was particularly diligent in the mitzvah of tzitzith. Once, hearing of a ("famed") harlot in the cities of the sea, who took four hundred gold coins as her hire, he sent her that sum, and she set a time for him. When the appointed time came, he went there and sat at the door of her house. Her maid-servant went in and said to her: That man whom you appointed a time for is sitting at the door of the house. The harlot: Let him come in. When he came in, she spread seven beds for him, six of silver and one of gold, and she was on the uppermost. Between each one was a silver ladder, and the uppermost, of gold. When he came to the act, his four tzitzith came and struck him across his face. They seemed to him like four men. He immediately left off and sat upon the ground. She, too, left off and sat upon the ground. She said to him "'Gapa of Rome' (an idolatrous oath), I shall not let you go until you tell me what blemish you have seen in me!" He: I swear, I have seen no blemish in you. There is no beauty like yours in all the world, but there is one mitzvah (tzitzith) concerning which it is written two times (Bamidbar 15:41) "I am the L-rd your G-d." "I am the L-rd your G-d" — I am destined to reward; "I am the L-rd your G-d" — I am destined to punish. And now they appeared to me as four witnesses (testifying to the above). At this, she said: I swear that I will not let you go until you write for me your name, the name of your city, and the name of the place where you study Torah. He wrote for her his name, the name of his city, the name of his master, and the name of the place where he studied Torah — whereupon she arose and divided all of her wealth: a third to the authorities (for permission to convert), a third to the poor, and a third which she took with her, in addition to those spreads. When she came to R. Meir's house of study, she said to him: My master, convert me. R. Meir: Is it possible that you have "cast your eyes" upon one of my disciples! At this, she took out the note that she had with her, and he said to her: "Go and claim your purchase!" Those spreads which she had spread for him unlawfully, she now spread for him lawfully, This was her reward in this world. As to the world to come, I do not know how much.