Abdur Rahman bin Abi Na'm عبد الرحمن بن أبي نعم · The Book of Financial Transactions

"The Messenger of Allah said: 'Dates for dates, wheat for wheat, barley for barley, salt for salt, exchanged hand to hand. Whoever gives more or takes more has engaged in Riba unless they are of different types."

"do not sell surplus water, for the Prophet forbade the sale of surplus water."

"A man gave the Messenger of Allah a skin full of wine, and the Prophet said to him;' did you know that Allah has forbidden it?' He whispered something and I did not understand what he whispered as I wanted to. I asked a person who was beside him and the Prophet said to him; 'What are you whispering about?' He said: 'I told him to sell it.' The Prophet said: 'The One Who forbade drinking it also forbade selling…