2 Chronicles 35:15 RHE

15 And the singers the sons of Asaph stood in their order, according to the commandment of David, and Asaph, and Heman, and Idithun, the prophets of the king: and the porters kept guard at every gate, so as not to depart one moment from their service, and therefore their brethren the Levites prepared meats for them.