2 Chronicles 35:1-4
1-4Josiah celebrated the Passover to God in Jerusalem. They killed the Passover lambs on the fourteenth day of the first month. He gave the priests detailed instructions and encouraged them in the work of leading worship in The Temple of God. He also told the Levites who were in charge of teaching and guiding Israel in all matters of worship (they were especially consecrated for this), "Place the sacred Chest in The Temple that Solomon son of David, the king of Israel, built. You don't have to carry it around on your shoulders any longer! Serve God and God's people Israel. Organize yourselves by families for your respective responsibilities, following the instructions left by David king of Israel and Solomon his son.
5-6"Take your place in the sanctuary—a team of Levites for every grouping of your fellow citizens, the laity. Your job is to kill the Passover lambs, then consecrate yourselves and prepare the lambs so that everyone will be able to keep the Passover exactly as God commanded through Moses."