I Chronicles 16:37-40

So he left Asaph and his brothers there before the ark of the covenant of the LORD to minister before the ark regularly, as every day’s work required; and Obed-Edom with his sixty-eight brethren, including Obed-Edom the son of Jeduthun, and Hosah, to be gatekeepers; and Zadok the priest and his brethren the priests, before the tabernacle of the LORD at the high place that was at Gibeon, to offer burnt offerings to the LORD on the altar of burnt offering regularly morning and evening, and to do according to all that is written in the Law of the LORD which He commanded Israel