Muhammad bin Mhbwb al-Binany محمد بن محبوب البناني · 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".