Matthew Henry Presbyterian @wholebiblehenry

We are now drawing towards the close of the history of Jehoshaphat's reign, for a further account of which those who lived when this book was published were referred to an authentic history of it, written by Jehu the prophet (Ch2 19:2), which was then extant, Ch2 20:34.

Commenting on 2 Chronicles 20:31-37

Jamieson-Fausset-Brown Reformed @jfbcommentary

walked in the way of Asa his father, and departed not from it--He was more steadfast and consistently religious (compare Ch2 15:18).

Geneva Bible Notes Reformed @genevanotes

And he walked in the way of Asa his father, and departed not from it, doing [that which was] right in the sight of the LORD. (s) Meaning, in his virtues, and those ways in which he followed God.