2 Kings 11:5-7

5Then he commanded them, saying, “This is what you shall do: one-third of you who come on duty on the Sabbath shall be keeping watch over the king’s house,

6one-third shall be at the gate of Sur, and one-third at the gate behind the escorts. You shall keep the watch of the house, lest it be broken down.

7The two contingents of you who go off duty on the Sabbath shall keep the watch of the house of the Lord for the king.