Are the funds in banks such as Banque Misr, National Bank of Egypt, Bank of Alexandria, and Faisal Islamic Bank considered usurious or Islamic?

If the capital of a Riba-based bank is originally from a lawful source, then it is lawful. However, its profits and interests gained from Riba and unlawful transactions are prohibited, as Allah Almighty says: "But if you repent, you may have your principal – [thus] you do no wrong, nor are you wronged."

As for Faysal Islamic Bank, it claims adherence to Sharia (definition) principles, and it cannot be called Riba-based as long as this is the case, even if some errors or violations occur.