'Fellow prisoner' in the Bible

Aristarchus, my fellow prisoner, wishes to be remembered to you; as does Mark, the cousin of Barnabas (about whom you received instructions; if he comes to you, welcome him);

Greetings to you from Epaphras, my fellow prisoner here in [the cause of] Christ Jesus,

Remember those who are in prison, as if you were their fellow prisoner, and those who are mistreated, since you also are in the body [and subject to physical suffering].