Sunan al-Nasa'i The Book of Financial Transactions Hameed bin Qays حميد بن قيس Imam Maalik مالك بن أنس بن مالك بن أبي عامر Mujahid bin Jabir مجاهد بن جبر Qutayba bin Sa'id bin Jamil قتيبة بن سعيد بن جميل “The Messenger of Allah said: ‘(Exchanging) gold for silver is Riba unless it is done on the spot. (Exchanging) dates for dates is Riba unless it is done on the spot. (Exchanging) wheat for wheat is Riba unless it is done on the spot. (Exchanging) barley is Riba unless it is done on the spot.”‘ https://parallelquran.com/hadith/sunan-al-nasai-4568/