Sahih Muslim Book 010, Hadith Number 3845.

Chapter : Sale of wheat like for like.

Abu Salid al-Khudri reported Allah's Messenger (may peace be upon him) as saying: Do not sell gold for gold, except like for like, and don't increase something of it upon something; and don't sell silver unless like for like, and don't increase something of it upon something, and do not sell for ready money something to be given later.

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