Buying and Selling: Selling Usurped Property and the Owner's Authorisation

Practical Laws of Islam as per the teachings of Ayatullah Sistani

Ruling 2098

If a person usurps some property and sells it, and after that the owner of the property authorises the transaction, the transaction is valid. From the time of the transaction, the property that the usurper sells to the buyer and its usufruct belong to the buyer. And from the time of the transaction, the thing that the buyer gives and its usufruct belong to the person whose property was usurped.

-Ayatullah Sistani, Practical Laws of Islam, Buying and Selling