Ribaa (interest or usury) & Money Exchange
Can she take the profits on certificates from the Islamic and commercial banks?
Ruling on being a witness to a riba-based loan
The bank offered to freeze part of his account in return for interest
Buying gold through a site on the internet
Islamic financial system
Should he use bank interest to pay off taxes?
Putting money in riba-based banks
She is helping her husband to buy a flat, but he borrowed the money with interest
Taking money from the insurance company with the stipulation that more be paid in the event of delay
Riba in Islam: Permissible?
Riba in Islam is not permissible according to the Quran and Sunnah, and definitive scholarly consensus. Riba is one of the major sins. For more, see the detailed answer