Religious reformation in Judah during the reign of King Josiah (с 640–609 BC).
As Assyria's hold on Israel weakened, Josiah waged a campaign against foreign cults and had their altars and idols removed from the Temple. He called for a return to the observance of Mosaic Law, based on the book of the Law discovered in the Temple of Jerusalem (с 622 BC), believed to be the same book as the law code in the Book of Deuteronomy. Rural sanctuaries and fertility cults were destroyed and the worship of Yahweh (the God of Israel) was centralized at Jerusalem.