Genesis 3:14-15

The LORD God said to the snake, “Because you did this, a curse will be put on you. You will be cursed as no other animal, tame or wild, will ever be. You will crawl on your stomach, and you will eat dust all the days of your life. I will make you and the woman enemies to each other. Your descendants and her descendants will be enemies. One of her descendants will crush your head, and you will bite his heel.”