2 Kings 23:20-24

All the priests of the high places who were there he slaughtered on the altars, and burned human bones on them [to desecrate the places forever]. Then he returned to Jerusalem.Passover Reinstituted

Then the king commanded all the people, saying, “Celebrate the Passover to the Lord your God as it is written in this book of the covenant.”

Indeed, such a Passover as this had not been held since the days of the judges who judged Israel, nor in all the days of the kings of Israel and the kings of Judah.

But in the eighteenth year of King Josiah, this Passover to the Lord was kept in Jerusalem.

Moreover, Josiah removed the mediums and the soothsayers and the teraphim (household gods) and the idols and all the repulsive things that were seen in Judah and in Jerusalem, so that he might fulfill the words of the law written in the book which Hilkiah the priest found in the house (temple) of the Lord.