I'm just getting things going not trying to blog hog the thread.
Remember the prisoners as bound with them, and those who are ill-treated as being yourselves also in the body." (v.2)
Christians should remember brothers and sisters in incarceration.
Christians should remember loved ones or anyone God touches them to remember, who is in jail.
The ill-treated are the oppressed. They may be oppressed for being Christians. They may be ill-treated and oppressed for some other reason - race, nationality, poverty, their sins, etc.
There is no limit it seems to me.
"ill-treated" is as open ended as it needs to be. As much grace as you have to care, let Christ in you care.
You have to sometimes think of yourself as in prison right along WITH that imprisoned one -
"Remember the prisoners as bound with them ..."
Not "forget about them" but "remember them". I have visited prisons. I have not done enough of it. I have done a little. I have written unbelievers in prison and visited relatives who were believers, in prison.
We have borne with those with long sentences and seen them released. We prayed for they're being sustained by God in the difficulty.
Recently, one loved one, a Christian, completed a 20 years sentence.
We bore him up in our prayers. His mother visited often. My wife and I a couple of times.