"Does dealing with a riba-based bank through current accounts necessary for work, with no interest taken, and using a credit card covered by a cash balance with repayment before the due date, along with disposing of the deposit's interest, lead to engaging in what is forbidden; and is it permissible to benefit from the airline's added card points, and what is the suitable book for studying Islamic economics? "

"Praise be to Allah, and blessings and peace be upon the Messenger of Allah, and upon his family and companions. As for what follows:

It is not permissible to deal with usurious banks in the presence of Islamic banks. The Islamic Fiqh Academy has forbidden Muslims from dealing with usurious banks if an Islamic alternative is available. The fact that some Islamic banks have errors does not make them like the usurious banks.

It is necessary to withdraw money and close accounts in usurious banks and search for the best Islamic banks. As for the points previously gained from credit cards, one can benefit from them due to ignorance of the prohibition.

Regarding the book required to understand the Islamic economy, there is a book called \""Research in Islamic Economics,\"" and it is good for clarifying the concept, and it has not been translated.

And Allah knows best."