al-Hasan al-Basri الحسن البصري · The Book of Financial Transactions

"The Messenger of Allah said: 'The two parties to a transaction both have the choice so long as they have not separated or they have chosen to conclude the transaction.' Or perhaps Nafi said: "Or one of them has said to the other: 'Decide! (Sahih )

"When two men enter into a transaction, each of them has the choice until they separate." On one occasion he said: "So long as they have not separated and one has not told the other to decide. If one tells the other to decide and they agree upon something, then the transaction is binding. If they separate after entering into a transaction and neither of them has canceled the transaction, then the transaction is binding." (Sahih )

"The Messenger of Allah said;" Two traders have the choice as long as they have not separated, or until they reach a deal that suits both of th4em or that is satisfactory (to both)"

"He put his armor in pledge for that with a Jew in Al-Madinah, and he took some barley from him for his family.

"The Messenger of Allah forbade charging stud fees for a stallion."

"A man from Banu As-Sa'q, one of Banu Kilab, came to the Messenger of Allah and asked him about charging stud fees for a stallion. He forbade him to do that, but he said: 'We give payment for that. "'