2 Chronicles 35:14-16

Young's Literal Translation

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.

¹⁶ And all the service of Jehovah is prepared on that day, to keep the passover, and to cause to ascend burnt-offering upon the altar of Jehovah, according to the command of king Josiah.