2 Chronicles 35:13-15

Young's Literal Translation

¹³ And they cook the passover with fire, according to the ordinance, and the sanctified things they have cooked in pots, and in kettles, and in pans -- for all the sons of the people.

¹⁴ And afterward they have prepared for themselves, and for the priests: for the priests, sons of Aaron, [are] in the offering up of the burnt-offering and of the fat till night; and the Levites have prepared for themselves, and for the priests, sons of Aaron.

¹⁵ And the singers, sons of Asaph, [are] on their station, according to the command of David, and Asaph, and Heman, and Jeduthun seer of the king, and the gate keepers [are] at gate and gate; it is not for them to turn aside from off their service, for their brethren the Levites have prepared for them.