2 Chronicles 23:4-6

4This is what you must do: The priests and Levites who come to work on the Sabbath day must make three groups. One group must be guards who watch at the doors of the temple.

5Another group will watch at the king's palace. The third group will stand at the Foundation Gate. All the other men will stand in the yards around the Lord's temple.

6Only the priests and the Levites who have work there on that day may go into the Lord's temple. They may go in because they have made themselves clean to serve God. All the other people must do the jobs that the Lord has given to them.