2 Kings 11:5-7

5And he commanded them, saying, This is the thing that ye shall do; A third part of you that enter in on the sabbath shall even 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 guard: so shall ye keep the watch of the house, that it be not broken down.1

7And two parts of all you that go forth on the sabbath, even they shall keep the watch of the house of Yhwh about the king.2