(15) باب الصَّرْفِ وَبَيْعِ الذَّهَبِ بِالْوَرِقِ نَقْدًا
Abu Huraira (Allah be pleased with him) reported Allah's Messenger (ﷺ) as saying:
Let dinar be exchanged for dinar, with no addition on either side and dirham be exchanged for dirham with no addition on either side.
Reference: Sahih Muslim 1588 d
In-book reference: Book 22, Hadith 108
USC-MSA web (English) reference(deprecated numbering scheme): Book 10, Hadith 3858