Sayyiduna Malik bin Aws (may Allah be pleased with him) narrates: He wanted to exchange one hundred dinars. He says: Sayyiduna Talhah bin Ubaidullah (may Allah be pleased with him) called me, and we both agreed on the transaction. He completed the exchange with me and took the gold, turning it over in his hand. He said: My clerk comes from the forest (Ghābah), (then I will pay you). Sayyiduna Umar bin Khattab (may Allah be pleased with him) heard this. Sayyiduna Umar (may Allah be pleased with him) said: By Allah, you will not separate from him until you receive it from him. Then Sayyiduna Umar (may Allah be pleased with him) informed that the Prophet (peace and blessings of Allah be upon him) said: "Exchanging gold for silver is usury except when it is hand to hand; exchanging wheat for wheat is usury except when it is hand to hand; exchanging dates for dates is usury except when it is hand to hand; exchanging barley for barley is usury except when it is hand to hand."