Genesis 49:15-17

Young's Literal Translation

¹⁵ And he seeth rest that [it is] good, And the land that [it is] pleasant, And he inclineth his shoulder to bear, And is to tribute a servant.

¹⁶ Dan doth judge his people, As one of the tribes of Israel;

¹⁷ Dan is a serpent by the way, An adder by the path, Which is biting the horse's heels, And its rider falleth backward.