Matthew 18:34

To the tormentors] Torture was not a Jewish or Roman punishment for debtors, but it would naturally be applied by an Eastern despot to make the debtor disclose where he had hidden his treasures.

Till he should pay all that was due] 'i.e. (says St. Chrysostom) for ever; for he can never possibly pay.' Others more plausibly see in the 'till,' a hope, or at least a possibility, of final release: see on Matthew 12:32.