מדרש אויף בראשית 3:15

"And the snake." He thought at that moment and said, I will go and I will kill Adam, and I will marry Eve, and I will be king over all the living creatures and I will walk around with an erect stature and eat of all the dainties of the world. The Holy One said to him, Because you said, I will go and I will kill Adam and I will marry Eve, therefore, "I will place enmity between you and the woman."(Genesis 3:15) You said, I will be king over all the living creatures, therefore, "more cursed shall you be than all beasts." (Genesis 3:14) You said, I will walk around with an erect stature, therefore, "on your belly you shall crawl." (Genesis 3:14) You said, I shall eat of the dainties of the world, therefore, "and dirt shall you eat all the days of your life." (Genesis 3:14)

R. Samuel bar Nahmani said (Prov. 16:7): <WHEN THE LORD IS PLEASED WITH ONE'S WAYS,> HE MAKES EVEN HIS ENEMIES TO BE AT PEACE <WITH HIM>.⁶See also yTer. 8:7 (46a). This refers to the snake, of whom it is written (in Gen. 3:15): AND I WILL PUT ENMITY < BETWEEN YOU AND THE WOMAN, >…. Now when the Holy One is pleased with the ways of a person, he makes the one to be at peace with the other. There is a story about a certain snake who came hissing from the field. He entered someone's house on the Sabbath eve at nightfall, and saw a bowl of crushed garlic placed on the table. He put his mouth over it to eat the garlic. After he had eaten it, he vomited it into <the bowl>. Then he covered the bowl just as it had been at first. Another house snake saw it. What did he do? He went and uncovered the bowl. When they found it uncovered, they emptied it out. Who caused this householder not to die? The snake who uncovered <the bowl>. Ergo, (in Prov. 16:7): WHEN THE LORD IS PLEASED WITH ONE'S WAYS, <HE MAKES EVEN HIS ENEMIES TO BE AT PEACE WITH HIM>.

And ten upon the serpent: Its mouth was sealed shut. Its hands and feet were cut off. It eats dust. It sheds its skin and suffers like a woman in childbirth, and its voice carries from one end of the world to the other, yet its voice is not heard. "And I will put enmity..." (Genesis 3:15) Rabbi Chelfai said in the name of Rabbi Meir: Even if it eats delicacies and drinks the sweetest wine, it becomes dust in its mouth, as it says "and dust shall be the serpent's bread" (Isaiah 65:25). It gives birth every seven years. (Bechorot 8a) A person sees an animal or bird and is not bothered, but when he sees a snake he is bothered and curses it. Everything receives blessing but it remains accursed. Rabbi Meir would say a tradition: "And I will remove the evil beasts from the earth" (Leviticus 26:6) - this refers to the snake. And ten upon the earth: That it would absorb water on its own from now on: "And a mist rose up from the earth" (Genesis 2:6) That it is afflicted in its fruits. That it is afflicted with blight and mildew. That mountains and valleys were made upon it. That thornbushes and gravel were created upon it. That barren trees grew upon it. That thorns and thistles grew upon it. They plant a lot but it produces little. That it will testify about its dead in the future, as it says "And the land will reveal its blood, and will no longer cover its slain" (Isaiah 26:21). That it is destined to wear out like a garment, as it says "And the earth will wear out like a garment" (Isaiah 51:6). Why were these forty decrees? Corresponding to the 40 days that the fetus is formed. Another interpretation: Corresponding to these decrees, the Sages instituted 40 lashes in the court. How so? When a person stumbles in a sin that makes him liable for death by the hand of Heaven, they bring him to court and lash him, and immediately forgive him entirely. This is what is taught: "There are four death penalties by the court." (All those liable for excision who were lashed were exempted from their excision - Makkot 23a.) Rabbi Eliezer says: Adam was the blood of the world, and when Eve spilled it [by causing his death], she became liable for the blood of menstruation. Adam was the challah of the world, and when Eve defiled it [through sin], she became liable for separating challah. Adam was the light of the world, and when Eve extinguished it [through sin], she became liable to light the Shabbat candles. This corresponds to what was taught: "For three sins women die in childbirth: menstruation, challah, and lighting the candles" (Shabbat 31b).