Charles Ellicott Commentary 2 Chronicles 23:1

"And in the seventh year Jehoiada strengthened himself, and took the captains of hundreds, Azariah the son of Jeroham, and Ishmael the son of Jehohanan, and Azariah the son of Obed, and Maaseiah the son of Adaiah, and Elishaphat the son of Zichri, into covenant with him." — 2 Chronicles 23:1 (ASV)

THE FALL OF ATHALIAH, AND SUCCESSION OF JOASH.
(Compare to 2 Kings 11:4–20.)

Jehoiada strengthened himself. — Showed himself strong or courageous, behaved boldly (1 Samuel 4:9). The chronicler has substituted a favorite expression (hithchazzaq) for the term used in Kings, “Jehoiada sent.”

The captains of hundreds. —Their names, added here, are not given in 2 Kings 11:4. On the other hand, Kings reads, “the captains of the hundreds of the Carians (or body-guard) and the Runners (or couriers, i.e., royal messengers) “—terms which were probably obscure to the chronicler.

Azariah ... and Azariah. — Heb.,’Azaryâh ... and ‘Azaryâhû. (Compare to 2 Chronicles 21:2.) These names are introduced in the chronicler's well-known manner (by the prefix le , marking the object of the verb). His style is very visible in the additions to the narrative as compared with Kings.