"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 : Book 44, Hadith 123 English translation : Vol. 5, Book 44, Hadith 4575
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