2 Chronicles 23:4-6

Revised Standard Version

⁴ This is the thing that you shall do: of you priests and Levites who come off duty on the sabbath, one third shall be gatekeepers, ⁵ and one third shall be at the king’s house and one third at the Gate of the Foundation; and all the people shall be in the courts of the house of the Lord. ⁶ Let no one enter the house of the Lord except the priests and ministering Levites; they may enter, for they are holy, but all the people shall keep the charge of the Lord.