2 Chronicles 23:4

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 ,

Now this is what you are to do: A third of you priests and Levites who are going on duty on the Sabbath are to keep watch at the doors,

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 porters of the doors;