صحیح ابن حبان
Ibn Hibban
كتاب البيوع
Book of Sales
باب الربا - ذكر البيان بأن هذه الأجناس إذا بيعت بغير أجناسها وبينها التفاضل كان ذلك جائزا إذا لم يكن إلا يدا بيد-
Chapter: Usury - Clarification that selling these types for different types with a difference is allowed if hand to hand
1 hadith
Hadith 5018
Sayyiduna Ubadah bin Samit (may Allah be pleased with him) narrates that the Prophet Muhammad (peace and blessings be upon him) said: "Gold for gold, silver for silver, wheat for wheat, barley for barley (the exchange) must be equal and hand to hand. When their types differ, then sell as you wish, provided it is hand to hand."