content of level
One: Riba al-Fa l (i.e. an increase in quantity). This means that the two items exchanged in a particular deal are of the same type but the quantity of one of them is more than the other. Two: Riba al-Nas’ah (i.e. increase for a delay). This refers to an additional quantity of one of the exchanged items in return for delayed payment, or in return for delayed possession in the sale of two kinds that share the reason applicable to Riba al-Fadhl when one of them is not money.
Definition and Ruling: The Arabic term riba, which means ‘usury’, originally means ‘increase’. In Islamic usage it means ‘an increase in one of the two exchanged items without a compensation to offset this increase. Allah says: ‘Allah has made trade lawful and usury forbidden’ (2: 275).
Riba is a word used to describe adding extra amount upon returning borrowed money or things in order to delay it. It is one of two types according to the method followed but in both cases it is strictly forbidden.
Riba al Fadl is a term describing the deal exchanging the same type of commodities in different quantities favoring one of the parties and this is strictly forbidden in Islam even if the quality is different.