Sa'id ibn al-Musayyib سعيد بن المسيب بن حزن أبو محمد 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 Prophet forbade a town-dweller to sell for a desert- dweller, even if he was his father or brother. (Sahih )

"Do not go out to meet the riders, and do not urge someone to cancel a sale he has already agreed upon os as to sell him your own goods, do not artificially inflate prices, and let not a town-dweller sell for a desert-dweller." (Sahih )

the Messenger of Allah forbade artificially inflating prices, meeting traders on the way, and for a town-dweller to sell for a desert-dweller." (Sahih )

"the Messenger of Allah forbade selling the fruit of date palms until they are fit to eat."

Rafi bin Khadij and Sahl Bi Abi Hathamah narrated that the Messenger of Allah forbade Muzabanah, which means selling fresh dates still on the tree for dried dates, except in cases of 'Araya, for which he gave permission. (Sahih

"The Messenger of Allah granted a concession allowing 'Araya sales by estimate."

"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."'