2 Chronicles 21:11

Moreover, he made high places in the mountains of Judah,.... Temples and altars for idols, which, being built on mountains, had the name of high places; and these Jehoram made or rebuilt were those which had been pulled down by Asa and Jehoshaphat:

and caused the inhabitants of Jerusalem to commit fornication; that is, idolatry, drawing them by his own example to worship Baal, for he did what Ahab and his family did, 2 Chronicles 21:6, and compelled Judah thereto; the inhabitants of Jerusalem falling into the same idolatrous practice with him, he forced the inhabitants of the cities, and in the country, to do the same, who it seems were not so willing and ready to comply therewith.