(42) باب بَيْعِ التَّمْرِ بِالتَّمْرِ
Abu Hurairah said:
"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."
Reference: Sunan an-Nasa'i 4559
In-book reference: Book 44, Hadith 111
English translation: Vol. 5, Book 44, Hadith 4563