2 Chronicles 8:13-15

Young's Literal Translation

¹³ even by the matter of a day in its day, to cause to ascend according to the command of Moses, on sabbaths, and on new moons, and on appointed seasons, three times in a year -- in the feast of unleavened things, and in the feast of weeks, and in the feast of booths.

¹⁴ And he establisheth, according to the ordinance of David his father, the courses of the priests over their service, and of the Levites over their charges, to praise and to minister over-against the priests, according to the matter of a day in its day, and the gatekeepers in their courses at gate and gate, for so [is] the command of David the man of God.

¹⁵ And they have not turned aside [from] the command of the king concerning the priests and the Levites, in reference to any matter, and to the treasures.