The extra amount or thing received as usury is not an exchange of anything in a financial deal, i.e. the usurer gives nothing in exchange for the extra amount he has received. Hence, it is grave injustice.

Usury [i.e. interest] ruins trading and business. The usurer [i.e. interest-taker] considers it very easy to obtain wealth without making any effort instead of investing his money in business and trade which also involves risks. And lack of business and trade affects economy.

Trend of usury affects mutual affection. When a person becomes habitual of receiving interest, he does not like to help anyone by lending him any money without interest.

Usury makes a person crueller than even beasts. The usurer wishes that his debtor be ruined. In addition, usury causes grave loss. If Shari’ah forbids anything, there is certainly wisdom behind it.

(Khaza`in-ul-‘Irfan, pp. 96-97)

4 blessed sayings of the Beloved Rasool صَلَّى اللهُ تَعَالٰى عَلَيْهِ وَاٰلِهٖ وَسَلَّم in                      condemnation of usury

1.         The Blessed Rasool صَلَّى اللهُ تَعَالٰى عَلَيْهِ وَاٰلِهٖ وَسَلَّم cursed the taker, giver, writer, and witnesses of usury [i.e. interest], and said that all of them are equal [sinners]. (Sahih Muslim, pp. 862, Hadees 1598)

The Beloved Rasool صَلَّى اللهُ تَعَالٰى عَلَيْهِ وَاٰلِهٖ وَسَلَّم has stated: If anyone knowingly consumes a dirham of usury, it is more severe than committing fornication thirty six times. (Musnad Imam Ahmad, vol. 8, pp. 223, Hadees 22016)

The Beloved and Blessed Rasool صَلَّى اللهُ تَعَالٰى عَلَيْهِ وَاٰلِهٖ وَسَلَّم has stated: In the night of Mi’raaj, I passed by such people whose stomachs were like houses with snakes in them which were also visible from the outside of their stomachs. I asked Jibra`eel (عَـلَيْـهِ الـسَّـلَام), ‘Who are these people?’ He replied, ‘They used to take usury.’ (Sunan Ibn Majah, vol. 3, pp. 72, Hadees 2273)