'Watch' in the Bible

And in the fourth watch of the night he came unto them, walking upon the sea.

Watch therefore: for ye know not on what day your Lord cometh.

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

Watch therefore, for ye know not the day nor the hour.

Then saith he unto them, My soul is exceeding sorrowful, even unto death: abide ye here, and watch with me.

And he cometh unto the disciples, and findeth them sleeping, and saith unto Peter, What, could ye not watch with me one hour?

Watch and pray, that ye enter not into temptation: the spirit indeed is willing, but the flesh is weak.