2 Chronicles 23:6-7

6But let no one enter the house of the Lord except the priests and 1the ministering Levites; they may enter, for they are holy. And let all the people keep the charge of the Lord. 7The Levites will surround the king, each man with his weapons in his hand; and whoever enters the house, let him be killed. Thus be with the king when he comes in and when he goes out.”