'Guard' in the Bible

When he had seized Peter, he put him in prison, turning him over to four squads of soldiers of four each to guard him [in rotation throughout the night], planning after the Passover to bring him out before the people [for execution].

When they had passed the first guard and the second, they came to the iron gate that leads into the city. Of its own accord it swung open for them; and they went out and went along one street, and at once the angel left him.

Take care and be on guard for yourselves and for the whole flock over which the Holy Spirit has appointed you as overseers, to shepherd (tend, feed, guide) the church of God which He bought with His own blood.

Therefore be continually alert, remembering that for three years, night or day, I did not stop admonishing and advising each one [of you] with tears.

When we entered Rome, Paul was allowed to stay by himself [in rented quarters] with the soldier who was guarding him.