2Ch 2 Chronicles, chapter Second Book of Chronicles, chapter 34
For in the eighth year of his reign, while he was yet na'ar (young), he began to seek after Elohei Dovid Aviv; and in the twelfth year he began to make tahor Yehudah and Yerushalayim from the high places, and the Asherim, and the pesilim, and the massekhot (molten images).