1 Chronicles 23:28-32

²⁸"but their duty shall be to assist the sons of Aaron for the service of the house of the LORD, having the care of the courts and the chambers, the cleansing of all that is holy, and any work for the service of the house of God; ²⁹to assist also with the showbread, the flour for the cereal offering, the wafers of unleavened bread, the baked offering, the offering mixed with oil, and all measures of quantity or size. ³⁰And they shall stand every morning, thanking and praising the LORD, and likewise at evening, ³¹and whenever burnt offerings are offered to the LORD on sabbaths, new moons, and feast days, according to the number required of them, continually before the LORD. ³²Thus they shall keep charge of the tent of meeting and the sanctuary, and shall attend the sons of Aaron, their brethren, for the service of the house of the LORD."