2 Chronicles 35:14-18

Afterward they prepared for themselves and for the priests, because the priests, the sons of Aaron, were offering the burnt offerings and the fat until night; so the Levites prepared for themselves and for the priests, the sons of Aaron.

The singers, the sons of Asaph, were also at their positions according to the command of David, Asaph, Heman, and Jeduthun the king’s seer; and the gatekeepers at each gate did not have to leave their service, because their kinsmen the Levites prepared for them.

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

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

There had not been a Passover celebrated like it in Israel since the days of Samuel the prophet; nor had any of the kings of Israel celebrated such a Passover as Josiah did with the priests, the Levites, all Judah and Israel who were present, and the inhabitants of Jerusalem.