Abdur-Razzaq عبد الرزاق بن همام · The Book of Financial Transactions

"When two people meet to engage in trade, the transaction between them is not binding until they separate, unless they have chosen to conclude the transaction."

" The Messenger of Allah ruled that what a slave earns belongs to his guarantor."

the Prophet forbade artificially inflating prices.

"When the Prophet (ﷺ) came to Al-Madinah, he called for a scale and weighed (something) for me and gave me more."

"A slave came and gave his pledge to the Messenger of Allah to emigrate, and the Prophet did not realize that he was a slave. Then his master came looking for him. The Prophet said; 'Sell him to me.' So he bought him for two black slaves, then he did not accept until he had asked; 'Is he a slave?'''

"The Messenger of Allah forbade charging stud fees for a camel, the sale of water, the renting of land for cultivation. Selling one's land and water, this is what the Prophet forbade."

"The Messenger of Allah forbade the price of a dog and stud fees for a stallion."

"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."'

"The Messenger of Allah said: 'Whoever sets free his share of a slave, and he has sufficient wealth to set him free completely by paying the price of the slave, then he should set him free with his own wealth."'