Is it obligatory to dispose of money acquired from selling digital images that were purchased randomly, after remembering that the original purchase involved Gharar (ambiguity/deception)?

The ruling on this method of sale varies depending on the value and difference of the images. The majority of scholars deem it invalid if the buyer has an option (khiyar). If the buyer does not have an option, we are not aware of anyone who deems it valid. Different opinions have been reported from the Imams regarding this issue. For example, Al-Shafi'i ruled the contract invalid if one buys a garment from two or three (sellers). Abu Hanifa differentiated between the presence and absence of the option. Malik permitted the sale if the items were similar and their descriptions not disparate, and if the buyer had the option. Since the sale has already occurred and the buyer was unaware of the ruling at the time of the transaction, there is no sin upon him regarding the money earned before knowing the ruling.