2 Chronicles 23:6-7

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.

7The Levites must stand around the king. Each man must hold his weapon in his hand. If anyone tries to come into the temple, you must kill them. You must stay near to the king everywhere that he goes.’