Amr bin Mnswr al-Nsa'iy عمرو بن منصور النسائي أبو سعيد · The Book of Financial Transactions

"The messenger of Allah said: 'Gold for gold, of equal measure; silver for silver, of equal measure; salt for salt, dates for dates wheat for wheat, barley for barley, like for like. Whoever gives more or takes more has engaged in Riba."' (Sahih) The wording is that of Muhammad Yaqub did not mention - "Wheat for wheat".

"I saw people being beaten (in punishment) at the time of the Messenger of Allah for buying food unmeasured and selling it before bringing it to their own camp."

"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."