2 Samuel 2:19 (BSB)

and he chased Abner, not turning to the right or to the left in his pursuit.

From 2 Samuel 2. Also in the ESV.

Commentary on 2 Samuel 2:19

• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on 2 Samuel 2:18-24: We have here the contest between Abner and Asahel. Asahel, the brother of Joab and cousin-german to David, was one of the principal commanders of David's forces, and was famous for swiftness in running: he was as light of foot as a wild roe (Sa2 2:18); this he got the name of by swift pursuing, not swift flying.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on 2 Samuel 2:19: And Asahel pursued after Abner,.... Ambitious of the glory of taking or slaying the general of the army of Israel; trusting to his swiftness, not considering that the race is not always to the swift, and that he had to do with a veteran soldier, and he a raw young man, though valiant: and in going he turned not to the right hand nor to...
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on 2 Samuel 2:19: ASAHEL SLAIN. (Sa2 2:19-32) Asahel pursued after Abner--To gain the general's armor was deemed the grandest trophy. Asahel, ambitious of securing Abner's, had outstripped all other pursuers, and was fast gaining on the retreating commander. Abner, conscious of possessing more physical power, and unwilling that there should be "blood" between himself and Joab, Asahel's brother, twice urged him to desist.
• Keil & Delitzsch (Lutheran), Biblical Commentary on the Old Testament on 2 Samuel 2:17-19: 2Sa 2:17-19 As this single combat decided nothing, there followed a general and very sore or fierce battle, in which Abner and his troops were put to flight by the soldiers of David. The only thing connected with this, of which we have any further account, is the slaughter of Asahel by Abner, which is mentioned here (2Sa 2:18-23) on account of the important results which followed.