Charles Ellicott Commentary 2 Samuel 23:37

"Zelek the Ammonite, Naharai the Beerothite, armorbearers to Joab the son of Zeruiah," — 2 Samuel 23:37 (ASV)

The Ammonite. —A foreigner, like “Igal of Zobah” (a Syrian), and “Ittai the Gittite,” and “Uriah the Hittite,” who rose to distinction in David’s service, and all of whom were probably proselytes.

Armourbearer. —It appears from 2 Samuel 18:15 that Joab had ten armourbearers. This one was probably their chief.