2 Chronicles 23:4-6

21st Century King James Version

⁴ This is the thing that ye shall do: A third part of you entering on the Sabbath, of the priests and of the Levites, shall be keepers of the doors;

⁵ and a third part shall be at the king’s house; and a third part at the Gate of the Foundation; and all the people shall be in the courts of the house of the Lord.

⁶ But let none come into the house of the Lord save the priests and those who minister of the Levites. They shall go in, for they are holy, but all the people shall keep the watch of the Lord.