Muslim scholars defined Ribaa (usury or interest) as the surplus of money a person receives in return for nothing when he exchanges something for something else. There are two kinds of Ribaa. The first one is Ribaa Al-Fadhl, which is taking a superior thing of the same kind of goods by giving more of the same kind of goods of inferior quality whether the things exchanged are food or something else. This kind is strictly forbidden in Sunnah and consensus.
The second kind is Ribaa An-Nasee'ah, which is an increase in the amount due, in return for a delay in payment.
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