'Watch' in the Bible

And they and their sons were at the gates of the house of Jehovah, the house of the tent, to keep watch there.

and round about the house of God they lodge, for on them is the watch, and they are over the opening, even morning by morning.

and David went out to meet them. He told them, "If you've come in peace to be of help to me, then you'll have my commitment. But if you've come to betray me to my enemies, even though I'm innocent of wrongdoing, then may the God of our ancestors watch and judge."

it was the west gate and the gate of Shallecheth on the ascending highway for Shuppim and Hosah.There were guards stationed at every watch.