2 Kings 23:21 (KJV)

And all the houses also of the high places that were in the cities of Samaria, which the kings of Israel had made to provoke the Lord to anger, Josiah took away, and did to them according to all the acts that he had done in Beth–el.

And he slew all the priests of the high places that were there upon the altars, and burned men’s bones upon them, and returned to Jerusalem.

And the king commanded all the people, saying, Keep the passover unto the Lord your God, as it is written in the book of this covenant.

Surely there was not holden such a passover from the days of the judges that judged Israel, nor in all the days of the kings of Israel, nor of the kings of Judah;

But in the eighteenth year of king Josiah, wherein this passover was holden to the Lord in Jerusalem.