'Watch' in the Bible

In the fourth watch of the night, Jesus came to them, walking on the sea.

Watch therefore, for you don't know in what hour your Lord comes.

But know this, that if the master of the house had known in what watch of the night the thief was coming, he would have watched, and would not have allowed his house to be broken into.

Watch therefore, for you don't know the day nor the hour in which the Son of Man is coming.

Then he said to them, "My soul is exceedingly sorrowful, even to death. Stay here, and watch with me."

He came to the disciples, and found them sleeping, and said to Peter, "What, couldn't you watch with me for one hour?

Watch and pray, that you don't enter into temptation. The spirit indeed is willing, but the flesh is weak."