Ezra
1 Chronicles 12:4ESV·traditional attribution

Ishmaiah of Gibeon, a mighty man among the thirty and a leader over the thirty; Jeremiah, Jahaziel, Johanan, Jozabad of Gederah,

Matthew Henry Presbyterian @wholebiblehenry

We have here an account of those that appeared and acted as David's friends, upon the death of Saul, to bring about the revolution. All the forces he had, while he was persecuted, was but 600 men, who served for his guards; but, when the time had come that he must begin to act offensively, Providence brought in more to his assistance.

Commenting on 1 Chronicles 12:1-22

John Gill Reformed Baptist @doctorgill

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, Jos 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...

Jamieson-Fausset-Brown Reformed @jfbcommentary

Ismaiah the Gibeonite--It appears that not only the Canaanites who were admitted into the congregation (Jos. 9:1-27), but people of the tribe of Benjamin, were among the inhabitants of Gibeon. The mention of "the Gederathite," probably from Gederah (Jos 15:36), in the lowlands of Judah; of the Korhites (Ch1 12:6), from Korah (Ch1 2:43), and of Gedor (Ch1 12:7), a town in Judah, to the...