Charles Ellicott Commentary 1 Chronicles 9:10

"And of the priests: Jedaiah, and Jehoiarib, Jachin," — 1 Chronicles 9:10 (ASV)

And of the priests; Jedaiah, and Jehoiarib, and Jaehin. —These three names do not designate persons, but three of the priestly courses, or classes, instituted by David according to 1 Chronicles 24:0, of which Jehoiarib was the first, Jedaiah the second, and Jachin the twenty-first. Nehemiah 11:10 has Jehoiarib son of Jedaiah, a mistake of the scribe. (Compare 1 Chronicles 9:7 and Note; Nehemiah 12:6.)