JMNT(i)
1 Let brotherly affection (= fondness for the Family; = friendly devotion to fellow believers) continuously remain!
2 Be continuously unforgetful (or: = un-neglecting) of fondness and affection to strangers and foreigners (or: Don't forget hospitality and friendliness to unexpected guests)! For you see, through this, some folks were unaware (oblivious; unconscious) of at some point receiving agents (or: messengers) as guests.
3 Be habitually reminding yourselves of those in bondage (or: bound ones; prisoners), as having been and now remaining bound together with [them]. [Take thought] of those maltreated (or: those continually being held by the bad or in the worthless), as being yourselves also within a body (or: as it were even being the same – in union with [that] body).