Nasr bin 'Ali bin Nasr bin 'Ali · The Book on Business

That the Prophet (ﷺ) said: "Gold for gold, kind for kind; silver for silver, kind for kind; dried-dates for dried-dates, kind for kind; wheat for wheat, kind for kind; salt for salt, kind for kind; and barley for barley, kind for kind. Whoever increases or seeks an increase, then he dealt with Riba. Sell gold for silver as you wish, hand to hand; and sell wheat for dried-dates as you wish, hand to hand; and sell barley for dried-dates as…

"Prices became excessive during the time of the Messenger of Allah (ﷺ), so they said: 'O Messenger of Allah! Set prices for us!' So he said: 'Indeed Allah is Al-Musa'ir, Al-Qabid, Al-Basir, Ar-Razzaq. And I am hopeful that I meet my Lord and none of you are seeking (recompense from) me for an injustice involving blood or wealth.'" This Hadith is Hasan Sahih.