John Gill Commentary 1 Chronicles 26:31

"Of the Hebronites was Jerijah the chief, even of the Hebronites, according to their generations by fathers` [houses]. In the fortieth year of the reign of David they were sought for, and there were found among them mighty men of valor at Jazer of Gilead." — 1 Chronicles 26:31 (ASV)

Among the Hebronites was Jerijah the chief, even among the
Hebronites
The posterity of Hebron, the son of Kohath:

according to the generations of his fathers ;
a principal man in the families that descended from his ancestors:

in the fortieth year of the reign of David ;
which was the last year of his reign, in which year all the above things were done; the distribution of the priests into their classes and courses, and so of the Levites, singers, and porters; as well as the appointment of those several judges and officers employed in divers parts of the land:

and particularly in this year those Hebronites were sought for, and there were found among them mighty men
of valour, at Jazer of Gilead ;
a city on the other side Jordan, which belonged to the tribe of Gad, see (Numbers 21:32) (Numbers 32:1Numbers 32:3Numbers 32:35) .