Ruling 2379
If a person knows that the property he has borrowed is usurped, he must return it to its owner; he cannot return it to the lender.
-Ayatullah Sistani, Practical Laws of Islam, Gratuitous Loan (ʿĀriyah)
Gratuitous Loan: Borrowing a Usurped Item
Practical Laws of Islam as per the teachings of Ayatullah Sistani
