2 Chronicles 20:33
Howbeit the high places were not taken away: for as yet the people had not prepared their hearts unto the God of their fathers. Howbeit the high places were not taken away: for as yet the people had not prepared their hearts unto the God of their fathers.
The high places that remained in the days of Jehoshaphat were heathen shrines where many of the people continued to worship because they had not committed their hearts to the God of their ancestors. Those shrines were not removed immediately, but were left standing for a time amid that divided worship. They endured because the people had not yet prepared their hearts unto the God of their fathers.