1Kgs 15:14

“Regarding many kings of the line of David, we read that they were saved not through their own merit but through the virtues of their father, David, who did that which was pleasing in the sight of God. And we come to Asa, the king of Judah, of whom it is written: "Asa did that which was right in the sight of the Lord, as did David, his father." And after a lengthy account of his many virtues, the story is concluded with these words: "But the high places he did not take away. Nevertheless, the heart of Asa was perfect with God all the days of his life." You see that he, too, is referred to as just, and his heart, indeed, was perfect with God, and yet he erred in that he did not take away the high places, as, we read, Hezekiah and Josiah had done.”

“"High places" refers to the altars that had been erected for the true God. This means that sacrifices were offered to God in any place, just like Solomon offered a thousand holocausts to God in Gibeon. Therefore the words "the high places were not taken away [by Asa]" mean that they did not worship or sacrifice before a single altar according to the commandment of God, that is, in Jerusalem, as is prescribed by the Law. [The Scripture] does not speak here about the altars [consecrated] to idols but about those consecrated to the true God.”