'Chasing' in the Bible

Who has the king of Israel come after? What are you chasing after? A dead dog? A flea?

Abner said to him, “Turn to your right or left, seize one of the young soldiers, and take whatever you can get from him.” But Asahel would not stop chasing him.

Once again, Abner warned Asahel, “Stop chasing me. Why should I strike you to the ground? How could I ever look your brother Joab in the face?”