2 Kings 11:5-8

5And he commanded them saying, This is the thing which ye shall do: a third part of you, that come in on the sabbath, shall be keepers of the watch of the king's house;

6and a third part shall be at the gate of Sur; and a third part at the gate behind the couriers; and ye shall keep the watch of the house for a defence.

7And the two parts of you, all those that go forth on the sabbath, even they shall keep the watch of the house of Jehovah about the king.

8And ye shall encompass the king round about, every man with his weapons in his hand; and he that comes within the ranks shall be put to death; and ye shall be with the king when he goes out and when he comes in.