http://en.wikipedia.org/wiki/Debt_relief#Origins<snip>
Origins
Debt relief existed in a number of ancient societies:
Debt forgiveness is mentioned in the Book of Leviticus, in which God councils Moses to forgive debts in certain cases every Jubilee year – at the end of Shmita, the last year of the seven year agricultural cycle or a 49-year cycle, depending on interpretation.
This same theme was found in an ancient bilingual Hittite-Hurrian text entitled "The Song of Debt Release".<1>
Debt forgiveness was also found in Ancient Athens, where in the 6th century BCE, the lawmaker Solon instituted a set of laws called seisachtheia, which canceled all debts and retroactively canceled previous debts that had caused slavery and serfdom, freeing debt slaves and debt serfs.
In addition, the Qur'an (the Muslim scripture) supports debt forgiveness unable to pay as an act of charity and remission of sins for the creditor. The injunction is as follows:
If the debtor is in difficulty, grant him time till it is easy for him to repay. But, if ye remit it by way of charity, that is best for you if ye only knew.
—Qur'an 2:280