Prepare yourselves by your fathers’ households in your divisions, according to the writing of David king of Israel and according to the writing of his son Solomon. Verse ConceptsWriting

Then Solomon offered burnt offerings to the LORD on the altar of the LORD which he had built before the porch; and did so according to the daily rule, offering them up according to the commandment of Moses, for the sabbaths, the new moons and the three annual feasts--the Feast of Unleavened Bread, the Feast of Weeks and the Feast of Booths. Now according to the ordinance of his father David, he appointed the divisions of the priests for their service, and the Levites for their duties of praise and ministering before the priests according to the daily rule, and the gatekeepers by their divisions at every gate; for David the man of God had so commanded. read more.
And they did not depart from the commandment of the king to the priests and Levites in any manner or concerning the storehouses. Thus all the work of Solomon was carried out from the day of the foundation of the house of the LORD, and until it was finished. So the house of the LORD was completed.

For they performed the worship of their God and the service of purification, together with the singers and the gatekeepers in accordance with the command of David and of his son Solomon.