2 Samuel 2:19

And Asahel pursued after Abner; and in going he turned not to the right hand nor to the left from following Abner.

Asahel locked onto Abner in pursuit and followed him straight on, refusing to turn aside to the right hand or to the left. The chase took place during the war between Israel and Judah, when Abner killed Asahel as his pursuer. Asahel's death then became the ground of a blood-feud that Joab later avenged by murdering Abner.