'Keep Watch' in the Bible

Keep watch, then, because you are not certain of the day or of the hour.

Then says he to them, My soul is very sad, even to death: keep watch with me here.

And he comes to the disciples, and sees that they are sleeping, and says to Peter, What, were you not able to keep watch with me one hour?

Keep watch with prayer, so that you may not be put to the test: the spirit truly is ready, but the flesh is feeble.