Riba (usury) is one of the types of exploitation in transactions. It entails great harm and involves unlawful earnings and taking extra money wrongfully. Therefore, it has been prohibited in all the revealed laws. In this Hadīth, Mālik ibn Aws ibn al-Hadathān (may Allah be pleased with him) reports that he came to a gathering and ‘Umar ibn al-Khattāb (may Allah be pleased with him) was among them. Mālik was saying: "Who will exchange the dirhams?" i.e., Who will buy the golden dinars that I have with silver dirhams, as Mālik ibn Aws ibn al-Hadathān had one hundred dinars - as mentioned in the version of Al-Bukhāri - which he wanted to exchange for dirhams. Talhah ibn ‘Ubaydullah - who was in this gathering with ‘Umar ibn al-Khattāb (may Allah be pleased with him) - said: "Show us your gold," i.e., give us your dinars to see them, "then come to us" later on "when our servant comes, we will give you your silver," i.e., the silver dirhams. On hearing this, ‘Umar ibn al-Khattāb (may Allah be pleased with him) said: "No," which indicates his refusal of this kind of transaction. Then, ‘Umar (may Allah be pleased with him) swore that he should give him the silver he wanted to buy on the spot, or he should give him back the gold that he took from him. He explained that by quoting the statement of the Messenger of Allah (may Allah's peace and blessings be upon him): "Silver for gold is Riba," i.e., selling silver for gold is Riba (usury) in all cases "unless they are exchanged on the spot," i.e., except in the case of physical presence and the immediate exchange of items hand to hand. Likewise, selling "Burr" - which is wheat - for Burr, selling barley for barley, and selling dried dates for dried dates all constitute Riba in all cases except in the case of physical presence and the immediate exchange of items hand to hand. The Hadīth denotes the prohibition of the Nasī’ah Riba (usury of deferred payment). It also encourages the act of forbidding evil for whoever has the ability to do so. It points out that the evidence should be mentioned when forbidding evil. It also shows that some knowledge may not be known to an old man until someone else reminds him of it..