Genesis 49:17

Dan shall be a serpent by the way, A viper by the path, That bites the horse's heels So that its rider shall fall backward.

Surrounding context

49:16 "Dan shall judge his people As one of the tribes of Israel.

49:17 Dan shall be a serpent by the way, A viper by the path, That bites the horse's heels So that its rider shall fall backward.

49:18 I have waited for your salvation, O LORD!