Buying and Selling: The Sale of Usurped Property
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 2072
The sale of usurped property is invalid unless the owner subsequently consents to it; and [if the owner does not,] the seller must return to the buyer the money he received from him.
-Ayatullah Sistani, Practical Laws of Islam, Buying and Selling


