2 Kings 23:19-23

Then Josiah also removed all the houses of the high places which were in the cities of Samaria, which the kings of Israel had constructed, provoking the Lord to anger; and he did to them just as he had done in Bethel.

And he slaughtered all the priests of the high places who were there on the altars, and burned human bones on them; 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.”

Truly such a Passover had not been celebrated 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 was celebrated to the Lord in Jerusalem.