2 Kings 11:5-7

5He commanded them, saying, “This is the thing that you shall do: a third of you who come in [reporting for duty] on the Sabbath shall keep watch over the king’s house

6(a third shall also be at the [city] gate Sur, and a third at the gate behind the guards); so you shall keep watch over the palace [from three posts] for defense.

7Two units of you, all those who go out [off duty] on the Sabbath, shall also keep watch over the house (temple) of the Lord for [the protection of] the king.