(16) باب النَّهْىِ عَنْ بَيْعِ الْوَرِقِ، بِالذَّهَبِ دَيْنًا
Abd al-Rabman b. Abia Bakra reported on the authority of his father that Allah's Messenger (ﷺ) forbade the sale of gold for gold, and silver for silver except equal for equal, and commanded us to buy silver for gold as we desired and buy gold for silver as we desired. A person asked him (about the nature of payment), whereupon he said:
It is to be made on the spot. This is what I heard (from Allah's Messenger (may peace be upon him ).
Reference: Sahih Muslim 1590 a
In-book reference: Book 22, Hadith 112
USC-MSA web (English) reference(deprecated numbering scheme): Book 10, Hadith 3861