2 Chronicles 35:15 in the King James Version
And the singers the sons of Asaph were in their place, according to the commandment of David, and Asaph, and Heman, and Jeduthun the king’s seer; and the porters waited at every gate; they might not depart from their service; for their brethren the Levites prepared for them.
Context
14 Afterward they prepared for themselves and for the priests, because the priests the sons of Aaron were busy with offering the burnt offerings and the fat until night. Therefore the Levites prepared for themselves and for the priests the sons of Aaron.
15 The singers, the sons of Asaph, were in their place, according to the commandment of David, Asaph, Heman, and Jeduthun the king’s seer; and the gatekeepers were at every gate. They didn’t need to depart from their service, because their brothers the Levites prepared for them.
16 So all the service of the LORD was prepared the same day, to keep the Passover, and to offer burnt offerings on the LORD’s altar, according to the commandment of King Josiah.