'Keep' in the Bible

So He gave directions to His disciples to keep a small boat in constant attendance on Him because of the throng--to prevent their crushing Him.

It is like a man living abroad who has left his house, and given the management to his servants--to each one his special duty--and has ordered the porter to keep awake.

and He said to them, "My heart is oppressed with anguish to the very point of death: wait here and keep awake."

Then He came and found them asleep, and He said to Peter, "Simon, are you asleep? Had you not strength to keep awake a single hour?

Be wakeful, all of you, and keep on praying, that you may not come into temptation: the spirit is right willing, but the body is frail."