GEN 49:17

17 Dan be made a serpent in the way, and (a) cerastes, that is, an horned adder, in the path, and bite he the feet of an horse, that the rider of him fall backward; (Let Dan be made a serpent on the way, and a cerastes, or a horned adder, on the path, and bite he the horse’s feet, so that his rider fall backwards;)