Sayyiduna Umar bin Khattab (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings of Allah be upon him) said: “If gold is exchanged for gold and it is not hand to hand, then it is usury; if dates are exchanged for dates and it is not hand to hand, then it is usury; if wheat is exchanged for wheat and it is not hand to hand, then it is usury; if barley is exchanged for barley and it is not hand to hand, then it is usury.”
Hadith Referenceالمنتقى ابن الجارود / كتاب البيوع والتجارات / 651
Hadith Gradingغلام مصطفےٰ ظهير امن پوري:صحيح
Hadith Takhrijاز غلام مصطفےٰ ظهير امن پوري:«صحيح البخاري : 2134 ، صحيح مسلم : 1586»