Bible Verses About Prisons: Sometimes allowed to be visited by their friends

Now when John had heard in the prison the works of Christ, he sent two of his disciples,

Naked, and ye clothed me: I was sick, and ye visited me: I was in prison, and ye came unto me.

And he commanded a centurion to keep Paul, and to let him have liberty, and that he should forbid none of his acquaintance to minister or come unto him.