2 Chronicles 34:3

3When Josiah had been king for eight years, he was still a young man. At that time he began to worship God, as his ancestor David had done. When he had been king for 12 years, he started to remove the places in Jerusalem and in all Judah where people worshipped false gods. He removed the altars on the hills, the Asherah poles, the idols and the images of false gods.