What should a person do who deposited his money with another to invest it in housing projects, then discovered that part of the money had been placed in a usurious bank? How should he deal with the principal amount and with the profits, not all of which are usurious?

This person committed a grave sin by placing the money in a usurious bank, due to his betrayal of trust and depositing it in a usurious bank. If the owner of the money becomes aware of this, he must withdraw the money immediately. Profits resulting from lawful investment in housing are divided according to the agreement, but profits resulting from placing money in the bank are ill-gotten gains that are not owned and must be given to the poor and needy, with the aforementioned person guaranteeing the principal to its owner. He is not entitled to any payment for this period.