'Heels' in the Bible

Dan will be a serpent in the way, an adder in the path, That bites the horse's heels, so that his rider falls backward.

Terrors shall make him afraid on every side, and shall chase him at his heels.

Why should I fear in the days of evil, when iniquity at my heels surrounds me?

If you say in your heart, Why are these things come on me? for the greatness of your iniquity are your skirts uncovered, and your heels suffer violence.