2 Kings 23:19-23

Also Josiah took away all the houses of the high places in the cities of Samaria which the kings of Israel had made, provoking the Lord to anger, and he did to them all that he had done in Bethel.

He slew all the priests of the high places that were there upon the altars and burned men's bones upon them [to defile the places forever]. Then he returned to Jerusalem.

The king commanded all the people, Keep the Passover to the Lord your God, as it is written in this Book of the Covenant.

Surely such a Passover was not held from the days of Israel's judges, even in all the days of the kings of Israel or Judah.

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