2 Chronicles 35:15 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. (Young's Literal Translation)