'Guard' in the Bible

When he had arrested him, he put him in prison, and delivered him to four squads of four soldiers each to guard him, intending to bring him out to the people after the Passover.

When they were past the first and the second guard, they came to the iron gate that leads into the city, which opened to them by itself. They went out, and went down one street, and immediately the angel departed from him.

When we entered into Rome, the centurion delivered the prisoners to the captain of the guard, but Paul was allowed to stay by himself with the soldier who guarded him.