Salim bin 'Abdullah bin 'Umar سالم بن عبد الله بن عمر بن الخطاب · The Book of Financial Transactions

"I heard the messenger of Allah say: "No man should urge anyone to cancel a sale he has already agreed upon with his brother so as to sell him his own goods; no town-dweller should sell for a desert-dweller; do not artificially inflate prices; no man should outbid his brother; and no woman should ask for her sister (in faith) to be divorced so as to turn over what is in her vessel (deprive her of her share of maintenance),

the Messenger of Allah forbade Mulamasah, which means touching a garment without looking at it, and Munabadha, which is where one man sells his garment to another man, by throwing it to him, without him checking it or looking at it.

"The Messenger of Allah stood up among us ad said: 'Do not sell fruits until their condition is known.""

the Messenger of Allah forbade selling fruits before they ripen. It was said: "O Messenger of Allah what does ripen mean?" he said: 'when they turn red." And the Messenger of Allah said: "What do you think if Allah withholds the fruits (causes it not to ripen), why would any one of you take his brother's wealth?"

"At the time of the Messenger of Allah, a ma suffered loss of some fruit that he had purchased, and his debts increased. The Messenger of Allah said: 'give him charity.' So the people gave him charity, but that was not enough to pay of his debts. The Messenger of Allah said: "Take what you find but you have no right to or than that.""

"I heard the Prophet say" something similar to the preceding two reports "until he takes possession of it."

"The Messenger of Allah forbade selling the produce several years in advance.

"The Messenger of Allah said: 'If one of you is referred to a rich man (to help repay a debt), he should accept that referral, and (wrongdoing) is when a rich man takes a long time to repay a debt."'