2 Chronicles 35:16-19

16So all the service of the Lord was prepared the same day, to keep the Passover and to offer burnt offerings on the altar of the Lord, according to the command of King Josiah.

17And the children of Israel who were present kept the Passover at that time, and the Feast of Unleavened Bread for seven days.

18There had been no Passover kept in Israel like that since the days of Samuel the prophet; and none of the kings of Israel had kept such a Passover as Josiah kept, with the priests and the Levites, all Judah and Israel who were present, and the inhabitants of Jerusalem.

19In the eighteenth year of the reign of Josiah this Passover was kept.