John Gill Commentary 2 Samuel 23:37

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

Zelek the Ammonite
Who was so either by birth, and became a proselyte; so the Targum says, he was of the children of Ammon; or is so called, because he had sojourned some time in their land, or had done some exploits against them; unless he was of Chepharhaammonai, a city of the tribe of Benjamin, (Joshua 18:24) ;

Naharai the Beerothite ;
native of Beeroth, a city in the same tribe, (Joshua 18:25) ;

armourbearer to Joab the son of Zeruiah ;
Joab had ten of them, this perhaps was the chief of them, (2 Samuel 18:15) ; who was advanced to be a captain, and therefore has a name and place among the thirty, very likely for some military, exploits performed by him; he is in the list of David's worthies, though not Joab his master, as before observed; the reason of Joab being left out is either because he was over them all, as before noted; according to Josephus ^F20 , Uriah the Hittite, after mentioned, was an armourbearer to Joab.

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FOOTNOTES:

• F20: Antiqu. l. 7. c. 7. sect. 1.