I will put hostility between you and the woman, and between your seed and her seed. He will strike your head, and you will strike his heel.
Genesis 3:15 In-Context
Then the LORD God said to the woman, “What is this you have done?” The woman said, “The serpent deceived me, and I ate.”
So the LORD God said to the serpent, “Because you have done this, “Cursed are you above all livestock and all wild animals! You will crawl on your belly and you will eat dust all the days of your life.
And I will put enmity between you and the woman, and between your offspring and hers; he will crush your head, and you will strike his heel.”
To the woman he said, “I will make your pains in childbearing very severe; with painful labor you will give birth to children. Your desire will be for your husband, and he will rule over you.”
To Adam he said, “Because you listened to your wife and ate fruit from the tree about which I commanded you, ‘You must not eat from it,’ “Cursed is the ground because of you; through painful toil you will eat food from it all the days of your life.