Sa'id bin Abi Sa'id · The Chapters on Business Transactions

"When two men enter into a transaction, each of them has the choice (of annulling it) so long as they have not yet parted and are still together, or one of them has given the option or choice to the other. Once he has accepted the terms of the other, then the transaction is binding. If they part after concluding the transaction and neither of them has rescinded the transaction then the transaction is binding.”

the Prophet (ﷺ) forbade selling Hablul-Habalah.

"There is no one who deals in usury a great deal (to increase his wealth) but he will end up with little (i.e., his wealth will be decreased)."