(47) باب بَيْعِ الذَّهَبِ بِالذَّهَبِ
It was narrated that Abu Saeed Al-Khudri said:
"My eyes saw and my ears heard the Messenger of Allah. And he mentioned the prohibition of (selling) gold for gold and silver for silver, unless it is equal amounts, like for like. And do not sell it in return for something to be paid later, and do not differentiate."
Reference: Sunan an-Nasa'i 4571
In-book reference: Book 44, Hadith 123
English translation: Vol. 5, Book 44, Hadith 4575