The answer is: Philemon

A little book, only 25 verses, found just before Hebrews.

Paul’s letter to Philemon is a fascinating and transformative text within the New Testament. At just 25 verses, it’s like a brief, powerful postcard bursting with profound themes. Unlike many of his other more formal letters to churches, Philemon is personal—Paul is addressing a fellow Christian to whom he has a close relationship.

Onesimus, Philemon's slave, had run away and found his way to Paul. This letter conveys a heartfelt plea for the transformation from slavery to brotherhood. Early scholars highlight how Paul subtly proclaims the radical nature of Christian relationships; in Christ, former slaves can become equals, illustrating love over hierarchy and societal norms.

Interestingly, "Onesimus" means “useful,” signifying a loving play on words, given his former status. Paul even capitalizes on this irony by referring to Onesimus as “formerly useless, but now useful.” It shows the personal and social revolution Christian principles can espouse, encouraging us to rethink our views on status and redemption.

Also noteworthy is the mention of a house church in Philemon’s home, indicating how early Christianity thrived primarily in intimate gatherings rather than grand cathedrals. This paints a picture of community—to not only gather in worship but transform social bonds as well!

So, Philemon reads as a love letter themed around forgiveness and reconciliation, echoing humanity’s potential to break free from traditional bondage and embrace one another as true siblings. It invites us all to re-examine our ways of relating, aimed more at compassion than power.