2 Chronicles 23:2-6

2They made a circuit throughout Judah. They gathered the Levites from all the cities of Judah and the family heads of Israel, and they came to Jerusalem.

3Then the whole assembly made a covenant with the king in God’s temple. Jehoiada said to them, “Here is the king’s son! He will reign, just as the Lord promised concerning David’s sons.

4This is what you are to do: a third of you, priests and Levites who are coming on duty on the Sabbath, are to be gatekeepers.

5A third are to be at the king’s palace, and a third are to be at the Foundation Gate, and all the troops will be in the courtyards of the Lord’s temple.

6No one is to enter the Lord’s temple but the priests and those Levites who serve; they may enter because they are holy, but all the people are to obey the requirement of the Lord.