This is what you are to do: A third of you priests and Levites who come on duty on the Sabbath shall keep watch at the doors,
KJV
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;
ASV
This is the thing that ye shall do: a third part of you, that come in on the sabbath, of the priests and of the Levites, shall be porters of the thresholds;