Buying and Selling: Buying Items Acquired Through Gambling, Theft, or Void Transactions
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 2078
Buying items that have been acquired through gambling, theft, or void (bāṭil) transactions is unlawful if this amounts to having disposal over them. If someone buys such an item and receives it from the buyer, he must return it to its original owner.
-Ayatullah Sistani, Practical Laws of Islam, Buying and Selling


