And he called out with a powerful voice, saying, “Fallen, fallen is Babylon the great! She has become a dwelling place for demons and a haunt (phylakē | φυλακή | nom sg fem) for every unclean spirit, a haunt (phylakē | φυλακή | nom sg fem) for every unclean bird, a haunt (phylakē | φυλακή | nom sg fem) for every unclean and detestable beast.

Do not fear what you are about to suffer. The devil is about to throw some of you into prison (phylakēn | φυλακήν | acc sg fem) so that you may be tested, and you will have affliction for ten days. Be faithful until death, and I will give you the crown of life.

in which also he went and proclaimed to the spirits in prison (phylakē | φυλακῇ | dat sg fem),

Others experienced jeering and flogging, and even chains and prison (phylakēs | φυλακῆς | gen sg fem).

Are they servants of Christ? — I am talking like a madman! — I am even more so: in far more labors, in prison (phylakais | φυλακαῖς | dat pl fem) more often, in beatings more severe, facing death again and again.

in beatings, in imprisonments (phylakais | φυλακαῖς | dat pl fem), in riots, in labors, in times of sleeplessness and hunger;

And I did so in Jerusalem; not only did I lock up in prison (phylakais | φυλακαῖς | dat pl fem) many of the saints, after receiving authority from the chief priests, and when they were put to death I cast my vote against them.

I persecuted the followers of this Way even to their death, putting in chains both men and women and delivering them to prison (phylakas | φυλακάς | acc pl fem),

So when they had left the prison (phylakēs | φυλακῆς | gen sg fem), they went to Lydia’s house; and when they saw the brothers, they encouraged them and departed.

But Paul said to them, “They have beaten us publicly, uncondemned, men who are Roman citizens, and have thrown us into prison (phylakēn | φυλακήν | acc sg fem); and now would they send us away in secret? No indeed! They themselves must come and escort us out.”