II Chronicles 35:16-19

So 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. And the children of Israel who were present kept the Passover at that time, and the Feast of Unleavened Bread for seven days. There 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. In the eighteenth year of the reign of Josiah this Passover was kept.