David gathered together all the leaders of Israel, as well as the priests and Levites

1 Chronicles 23:1-32 

When David was old and full of years, he made his son Solomon king over Israel. He also gathered together all the leaders of Israel, as well as the priests and Levites. The Levites thirty years old or more were counted, and the total number of men was thirty-eight thousand. David said, “Of these, twenty-four thousand are to be in charge of the work of the temple of the Lord and six thousand are to be officials and judges. Four thousand are to be gatekeepers and four thousand are to praise the Lord with the musical instruments I have provided for that purpose.”

David separated the Levites into divisions corresponding to the sons of Levi: Gershon, Kohath and Merari.

These were the descendants of Levi by their families—the heads of families as they were registered under their names and counted individually, that is, the workers twenty years old or more who served in the temple of the Lord. For David had said, “Since the Lord, the God of Israel, has granted rest to his people and has come to dwell in Jerusalem forever, the Levites no longer need to carry the tabernacle or any of the articles used in its service.” According to the last instructions of David, the Levites were counted from those twenty years old or more.

And so the Levites carried out their responsibilities for the tent of meeting, for the Holy Place and, under their relatives the descendants of Aaron, for the service of the temple of the Lord.

Why?

David arranged and organized their jobs in the Temple for the Levites to serve the Lord in the Temple, even though the Temple still needs to be built the servant of the Lord has arranged.

Service people are more important than the building of worship.

How?

All of us are servants of the Lord. Each one serves the Lord in different positions and missions, but all of us have the same mind to worship the Lord.