It is narrated from Abu Huraira (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "It is not permissible to have an excess in exchange of dinar for dinar and dirham for dirham."
Hadith Referenceمسند الإمام الشافعي / كتاب البيوع / 1387
Hadith Takhrijاخرجه مسلم ، المساقاة، باب الصرف وبيع الذهب بالورق نقدا (1588)۔