And the Lord God said unto the serpent, Because thou hast done this, thou [art] cursed above all cattle, and above every beast of the field; upon thy belly shalt thou go, and dust shalt thou eat all the days of thy life: (3:14)

And I will put enmity between thee and the woman, and between thy seed and her seed; it shall bruise thy head, and thou shalt bruise his heel. (3:15)

Dan shall be a serpent by the way, an adder in the path, that biteth the horse heels, so that his rider shall fall backward. (49:17)