John Gill Commentary 1 Chronicles 12

Now these are they that came to David to Ziklag Given him by Achish to live in, when he fled from Saul, (1 Samuel 27:6).

while he yet kept himself close, because of Saul the son of Kish ; when he was an exile from his own country, and obliged to live retired in a foreign one, because of Saul's persecution of him, and seeking to take away his life:

and they were among the mighty men, helpers of the war ; not against Saul, with whom David had none, but with the Amalekites, and others, (1 Samuel 27:8) (1 Samuel 30:16 1 Samuel 30:17).

They were armed with bows. Much used in war in those times.

and could use both the right hand and the left, in hurling stones, and shooting arrows out of a bow; they were ambidextrous; who could sling stones, or shoot arrows, with either, which was no small advantage to them.

even of Saul's brethren of Benjamin; they were of the tribe of Benjamin, of which Saul was, and so his brethren; and they might be, at least some of them, his relations and kinsmen; who observing the unreasonableness of Saul's enmity to David, and detesting his cruelty, and sensible of the innocence of David, and of the service he had done his country; and perhaps not being ignorant of his divine right and title to the kingdom, went over to him, to comfort, strengthen, and assist him.

The chief was Ahiezer, then Joash, the sons of Shemaah the Gibeathite Who was of Gibeah, in the tribe of Benjamin, sometimes called Gibeah of Benjamin, and of Saul, it being his birthplace, see (1 Samuel 11:4) (13:1) and so these might be some of his kindred: and Jeziel, and Pelet, the sons of Azmaveth ; there is one of this name in the posterity of Jonathan, (1 Chronicles 8:36) who might be so called after some of his relations: and Berachah, and Jehu the Antothite ; or Anethothite, as the Vulgate Latin version, who was of Anathoth, a city in the tribe of Benjamin, the native place of Jeremiah the prophet.

And Ishmaiah the Gibeonite, a mighty man among the thirty, and over the thirty That came with him, and he had the command of; this man was of Gibeon, another city in the tribe of Benjamin, (Joshua 18:25) and Jeremiah, and Jahaziel, and Johanan, and Josabad, the Gederathite ; one of Gederah, a city in the tribe of Judah, perhaps on the borders of that and Benjamin; Joram speaks of it as belonging to the country of the city Aelia or Jerusalem.

Eluzai, and Jerimoth, and Bealiah, and Shemariah, and
Shephatiah the Haruphite .
] A native of Haruph or Hariph, see (Nehemiah 7:24) .