And prepare yourselves by the houses of your fathers after your courses, according to the writing of David king of Israel, and according to the writing of Solomon his son. Verse ConceptsWriting

Then Solomon offered burnt-offerings to the LORD on the altar of the LORD, which he had built before the porch, Even after a certain rate every day, offering according to the commandment of Moses, on the sabbaths, and on the new moons, and on the solemn feasts, three times in the year, even in the feast of unleavened bread, and in the feast of weeks, and in the feast of tabernacles. And he appointed, according to the order of David his father, the courses of the priests to their service, and the Levites to their charges, to praise and minister before the priests, as the duty of every day required: the porters also by their courses at every gate: for so had David the man of God commanded. read more.
And they departed not from the commandment of the king to the priests and Levites concerning any matter, or concerning the treasures. Now all the work of Solomon was prepared to the day of the foundation of the house of the LORD, and until it was finished. So the house of the LORD was perfected.

And both the singers and the porters kept the ward of their God, and the ward of the purification, according to the commandment of David, and of Solomon his son.