2 Chronicles 35:14-15

14Afterward they made preparations for themselves and for the priests, because the priests, the descendants of Aaron, were offering burnt sacrifices and fat portions until evening. The Levites made preparations for themselves and for the priests, the descendants of Aaron.

15The musicians, the descendants of Asaph, manned their posts, as prescribed by David, Asaph, Heman, and Jeduthun the king’s prophet. The guards at the various gates did not need to leave their posts, for their fellow Levites made preparations for them.