Abdullah bin Wahb عبد الله بن وهب بن مسلم القرشي · The Book of Financial Transactions

"The Messenger of Allah said: 'The best (most pure) food that a man eats is that which he has earned himself, and his child (and his child's wealth) is part of his earning,"

"The Messenger of Allah said: 'Do and whoever meets any of them and buys from him the vendor has the choice of annulling the transaction when he comes to the marketplace."'

"The Messenger of Allah forbade two kinds of transactions: Mulamash and Munabddhah "

"The Messenger of Allah said: "If you sell fruits to your brother then the crop fails, it is not permissible for you it takes anything from him. Why would you take the wealth of your brother unlawfully?"'

"The Messenger of Allah said: "Volume is to be measured according to the system of the people of Al-Madinah, and weight is to be measured according to the system of the peole of Makkah."' (Sahih) This is the wording of Ishaq (one of the narrators).

"The Messenger of Allah said: 'Pre-emption is to be given in everything that is shared, whether it is a house or a garden. It is not right to sell it before informing one's partner, and if he sells it he (the partner) has more right to it, unless he gives Permission to sell it to someone else.

the Messenger of Allah forbade the price of dogs and cats, except hunting dogs. (Da'if) Abu 'Abdur-Rahman (An-Nasa'i) said: This is Munkar.

"Sa'd, 'Ammar and I entered into a partnership on the Day of Badr, (agreeing to share) whatever was allotted to us. 'Ammar and I did not get anything. But sa'd got two prisoners."

"Any one of you who has land, or date palm trees, he should not sell them until he offers them to his partner first."