Under the old rules Jews were supposed to forgive debts at set times, such as every seven years and the Jubilee year every 50 years. Jesus tossed those aside and said that if a person follows him then the believer has no debt claims against anyone. That's because the believer is expected to freely give whatever someone asks of him and he is not to expect repayment.
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http://www.bricktestament.com/the_teachi...05_41.html