Hisham bin 'Urwa هشام بن عروة · The Chapters on Business Transactions

"Do not practice Najsh."

"A City-dweller should not sell for a Bedouin."

the Prophet (ﷺ) forbade selling fruits until they have ripened.

"O Allah, bless my nation in their early mornings.". It was narrated from Abu Hurairah that the Prophet (ﷺ) said: "Whoever buys a Musarrah, he has the choice (of annulling the deal) for three days. If he returns it, then he must also give a Sa' of dates, not Samra'." Meaning wheat.

a man bought a slave and put him to work, then he found some defect in him, so he returned him. He (the seller) said: "O Messenger of Allah he put my slave to work." The Messenger of Allah (ﷺ) said: "A slave's earnings belong to his guarantor."

"A man came to the Prophet (ﷺ) and said, 'The tribe of Banu so-and- so, who were descended from the Jews, have become Muslim, and they are starving, and I am afraid that they may apostatize.' The Prophet (ﷺ) said: 'Who has something with him?' A Jewish man said: 'I have such and such, and he named it, and I think he said three hundred Dinar for such and such 'an amount (of produce) from the garden of the tribe…

"O Messenger of Allah, I have wealth and a son, and my father wants to take all my wealth." He said: "You and your wealth belong to your father."