1 Chronicles 16:37-40

So David left Asaph and his brothers there before the ark of the covenant of the LORD to minister regularly before the ark as each day required, and also Obed-edom and his sixty-eight brothers, while Obed-edom, the son of Jeduthun, and Hosah were to be gatekeepers. And he left Zadok the priest and his brothers the priests before the tabernacle of the LORD in the high place that was at Gibeon to offer burnt offerings to the LORD on the altar of burnt offering regularly morning and evening, to do all that is written in the Law of the LORD that he commanded Israel.