2 Chronicles 35:14-15

14Afterward the Levites prepared Passover offerings for themselves and for the priests—the descendants of Aaron—because the priests had been busy from morning till night offering the burnt offerings and the fat portions. The Levites took responsibility for all these preparations.

15The musicians, descendants of Asaph, were in their assigned places, following the commands that had been given by David, Asaph, Heman, and Jeduthun, the king’s seer. The gatekeepers guarded the gates and did not need to leave their posts of duty, for their Passover offerings were prepared for them by their fellow Levites.