2 Samuel 2:17-20
English Standard Version
18And the three sons of Zeruiah were there, Joab, Abishai, and Asahel. Now Asahel was as swift of foot as a wild gazelle.
19And Asahel pursued Abner, and as he went, he turned neither to the right hand nor to the left from following Abner.
20Then Abner looked behind him and said, "Is it you, Asahel?" And he answered, "It is I."