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How did a prisoner pay back debt in a 1st century prison? In Matthew 18:21-35 there is a prison that debtors go to payback their debts. Is this done by working there? Were some people there already slaves? Verse 30 of Matthew 18 speaks of the "man thrown into prison until he could pay the debt." How would he pay it back while in prison? What system did they have in place to pay it back?

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The clear questions posed might be worded this way: how, in Roman-era Palestine, would an imprisoned slave pay back a financial debt? The impetus comes from Jesus' parable of the unforgiving servant/slave of Matthew 18:21-35.

It really requires an answer in two parts: first, to explain why the concern of OP's main question would not be in the thoughts of those who first heard this parable; and second, to suggest some response to OP's question itself.

1. Why "paying back debt" in Matt 18:34 is somewhat irrelevant

Part of the point of this parable is that the unforgiving servant, who had his own debt of "10,000 talents" (μυρίων ταλάντων, Matt 18:24) remitted ("forgiven") will not "forgive" the paltry debt that he himself is owed.

According to the ESV Study Bible, 10,000 talents in "today's money" equates to about US$6 billion:

In approximate modern equivalents, if a laborer earns $15 per hour, at 2,000 hours per year he would earn $30,000 per year, and a talent would equal $600,000 (USD). Hence, “ten thousand talents” hyperbolically represents an incalculable debt—in today’s terms, about $6 billion.

Craig Keener has pointed out that, in any case, "the real worth of the debt in this story may be greater still: 10,000 being the largest single number Greek could express and the talent being the largest unit of currency, Jesus is making the parable particularly graphic." It is so great an amount that "the poor man owes the king more money than existed in circulation in the whole country at the time!"1

It would be a little bit like saying the debt was for "a billion bars of gold bullion!" Anyone hearing the sum would know immediately that the sum was unimaginably huge.

Gold bullion

As is often noted in treatments of the parable,2 the "unforgiving-ness" of the servant means that he has condemned himself to live out his days in the company of his tormenters ("torturers", really - τοῖς βασανισταῖς, v. 34), and the one hearing the parable is left to ponder

the crucial importance of being merciful in order to receive mercy.

As (probably) every study of this parable concludes, this is a debt that is impossible to pay back, whether in prison or otherwise -- which leads to our perception of this servant's own ungracious stupidity for failing to show to his fellow-servant the tiniest fraction of the mercy that had been shown to him (Matt 21:27, "The lord of that servant, being moved with compassion, released him, and forgave him the debt.").

2. Was debt repayment from prison possible anyway?

This leaves unanswered OP's question: "What system did they have in place to pay it back?" I have just three brief notes here; others might be able to elaborate further:

  • Regarding the suggestion initially made in the parable that "his lord commanded him to be sold, with his wife, his children, and all that he had, and payment to be made" (v. 25) -- it should be obvious by now -- wouldn't begin even to touch the mountain of debt accumulated. Keener (see note 1) records that the largest known sum paid for a slave was 1 talent, "the average being one twentieth to one fifth of that".
  • One possible way to pay was to find a patron who would pay the sum back for you. This might be analogous to our "bail" system, where the person charged and imprisoned person can raise the bail amount from whoever will help (Keener, p. 460 and n. 43).
  • Finally, noting the detail about "torturers" (see above) might figure in here, as in the Roman context, torture to extract goods was a known practice.3 In that way, it may simple be a feature of "consistent story-telling" ... and reinforces the point about this slave's inexplicable and even reprehensible character in light of his behaviour after being released from the debt he owed.


  1. Craig S. Keener, The Gospel of Matthew: A Socio-Rhetorical Commentary (Eerdmans, 2009), pp. 458-9.
  2. One example standing for many: D.J. Reimer, "The Apocrypha and Biblical Theology: The Case of Interpersonal Forgiveness", in After the Exile, ed. by J. Barton & D.J. Reimer (Mercer University Press, 1996), pp. 259-282; Matt 18:23-34 is discussed on pp. 269-70 [quote from p. 270].
  3. See on this point Jennifer Glancy, "Slaves and Slavery in the Matthean Parables", Journal of Biblical Literature, Vol. 119/1 (2000), pp. 67-90 (see pp. 85-87 for this parable in particular).
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