Moreover, he made high places in the hill country of Judah and led the inhabitants of Jerusalem into whoredom and made Judah go astray.
We find here, I. That Jehoshaphat was a very careful indulgent father to Jehoram. He had many sons, who are here named (Ch2 21:2), and it is said (Ch2 21:13) that they were better than Jehoram, had a great deal more wisdom and virtue, and lived up to their education, which he went counter to.
Commenting on 2 Chronicles 21:1-11
And hast walked in the way of the kings of Israel,.... Worshipping the calves, and even Baal, with other idols, as they did: and hast made Judah and the inhabitants of Jerusalem to go a whoring, like to the whoredoms of the house of Ahab; meaning spiritual whoredoms or idolatries: and hast also slain thy brethren of thy father's house, which were better than thyself...
Moreover he made high places in the mountains of Judah, and caused the inhabitants of Jerusalem to commit fornication, and compelled Judah [thereto]. (f) Meaning, idolatry because the idolater breaks promise with God as the adulteress does to her husband.