'Keep Watch' in the Bible

He commanded them, saying, “This is the thing that you shall do: one third of you, who come in on the sabbath and keep watch over the king’s house

(one third also shall be at the gate Sur, and one third at the gate behind the guards), shall keep watch over the house for defense.

Two parts of you, even all who go out on the sabbath, shall also keep watch over the house of the Lord for the king.