2 Chronicles 35:14-15

14And afterwards they made ready for themselves and for the priestsH3548; because the priestsH3548, the sonsH1121 of AaronH175, [were engaged] in offeringH5927 up the burnt-offerings and the fatH2459 until nightH3915; therefore the LevitesH3881 preparedH3559 for themselves, and for the priestsH3548, the sonsH1121 of AaronH175.

15And the singersH7891, the sonsH1121 of AsaphH623, were in their place, according to the commandmentH4687 of DavidH1732, and AsaphH623, and HemanH1968, and JeduthunH3038 the king's seerH2374; and the doorkeepers were at every gateH8179; they had not to departH5493 from their serviceH5656, for their brethren the LevitesH3881 preparedH3559 for them.