Shu'bah bin al-Hajjaj شعبة بن الحجاج · The Book of Financial Transactions

"The Messenger of Allah said: "The two parties to a transaction both have the choice who long as they have not separated or one of them says to the other: 'Decide!"' (Sahih )

"Two trades have the choice as long as until they reach a deal that suits both of them and they confirm it three times. "

"Dinar for Dinar Dirham for Dirham, no difference between them."

"There is no Riba except in credit.'

"I used to sell gold for silver, or silver for gold. I came to the Messenger of Allah and told him about that, and he said: 'If you make a deal with your companion, d o not leave him when there is still any ambiguity (in the deal) between you."'

the Prophet forbade anyone to sell food that he brought

"During the time the Messenger of Allah we used to buy food, and he sent someone to tell us to remove it from the place where we had bought it, to another place, b before selling"

"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 said: 'No man is bound by a transaction involving the sale of something that he does not possess.'''

the Prophet forbade Muhaqalah, Muzahanah, Mukhabarah and selling with an exception unless it is defined.

"We were with Abu 'Ubaidah bin 'Abdullah bin Mas'ud when two men who were involved in a transaction came to him. One of them said: 'I bought it for such and such', and the other said; 'I sold it to him for such and such,' Abu 'Ubaidah said" 'something like this was brought to Ibn Masud, and he said; I was with something like this was brought to him. He told the seller to swear an oath, them he gave…

"do not sell surplus water, for the Prophet forbade the sale of surplus water."

"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. "'

"If a woman is married off by two guardians, then the first marriage is the one that counts, and if a man sells something to two men, it belongs to the first one."