'Watch' in the Bible

He commanded them, saying, "This is the thing that you shall do: a third part of you, who come in on the Sabbath, shall be keepers of the watch of the king's house;

A third part shall be at the gate Sur; and a third part at the gate behind the guard. So you shall keep the watch of the house, and be a barrier.

The two companies of you, even all who go out on the Sabbath, shall keep the watch of the house of Yahweh around the king.