2 Chronicles 20:33 Commentary - English Annotations on the Holy Bible by Matthew Poole
The high places where not taken away; not fully nor universally; of which See Poole "2Ch 17:6". The fault was not in Jehoshaphat, but in the people, who, though they did worship the true God, yet would not be confined to the temple, but for their own conveniency, or from their affection to their ancient custom, chose to worship him in the high places; which Jehoshaphat was forced to connive at, lest those people, being debarred from that dearly-beloved practice, should fall into a neglect of God and his worship.
Consult other comments:
2 Chronicles 20:33 - Albert Barnes' Notes on the Bible
2 Chronicles 20:33 - Joseph Benson’s Commentary on the Old and New Testaments
2 Chronicles 20:33 - The Cambridge Bible for Schools and Colleges
2 Chronicles 20:33 - Adam Clarke's Commentary and Critical Notes on the Bible
2 Chronicles 20:33 - Companion Bible Notes, Appendices and Graphics
2 Chronicles 20:33 - Ellicott's Commentary for English Readers (Old and New Testaments)
2 Chronicles 20:33 - Geneva Bible Notes
2 Chronicles 20:33 - John Gill's Exposition of the Entire Bible
2 Chronicles 20:33 - English Annotations on the Holy Bible by Matthew Poole
2 Chronicles 20:33 - Scofield Reference Bible Notes
2 Chronicles 20:33 - John Trapp's Complete Commentary (Old and New Testaments)
English Annotations on the Holy Bible by Matthew Poole

Matthew Poole (1624–1679) wrote English Annotations on the Holy Bible, completing the chapters as far as Isaiah 58 before his death in 1679. The rest of the Annotations were completed by friends and colleagues among his Nonconformist brethren. The first printing of the completed edition was in 1685, 2 volumes folio, followed by editions in 1688, 1696 (with valuable chapter outlines added by the editors, Samuel Clark and Edward Veale), and the 4th and definitive edition in 1700, the basis of all others.