John Gill Commentary 2 Chronicles 13:22

"And the rest of the acts of Abijah, and his ways, and his sayings, are written in the commentary of the prophet Iddo." — 2 Chronicles 13:22 (ASV)

And the rest of the acts of Abijah, and his ways, and his
sayings
Not only his warlike actions, and his course of life, but some remarkable sayings of his, he being a man of wisdom and eloquence, as his above speech shows;

are written in the story of the prophet Iddo ;
who might write the history of his own times; see (1 Kings 15:7) .