Sayyiduna Ali bin Abi Talib (may Allah be pleased with him) narrates: The Noble Prophet (peace and blessings of Allah be upon him) said: "Dinar should be exchanged for dinar, dirham for dirham, without any additional payment. Whoever needs silver should trade it for gold, and whoever needs gold should trade it for silver, but this transaction must be hand to hand."
Hadith Referenceسنن الدارقطني / كتاب البيوع / 2880
Hadith Takhrij«أخرجه الحاكم فى ((مستدركه)) برقم: 2321، وابن ماجه فى ((سننه)) برقم: 2261، والدارقطني فى ((سننه)) برقم: 2880، والطبراني فى ((الأوسط)) برقم: 6347»