Is it necessary to retroactively dispose of varying profit percentages (70%, then all of it) in accordance with the changing fatwas regarding Faysal Bank, given that most of the profits have been spent, or is it sufficient to transfer the money to a current account and not take future profits? And would it be permissible to give out an equivalent of what was previously spent from other funds? How should the due profits be estimated if detailed account statements are unavailable? And is it permissible to deduct account expenses when calculating what will be retroactively given out?

It is not permissible for Islamic banks to deal in bonds or treasury bills, or to deposit money in interest-based (ribawi) banks for interest; because these are usurious loans, forbidden by Islamic law.

The resolution of the Islamic Fiqh Academy No. (62/11/6) explicitly prohibited interest-bearing bonds or bonds with stipulated benefits, as well as zero-coupon bonds and prize bonds, considering them usurious loans or involving gambling.

Accordingly, if it is known that the bank invests through these prohibited methods, it is not permissible to invest money in it; because the bank is a partner and agent for its clients, and thus they would share in the sin of these transactions. In such a case, one should restrict oneself to depositing money in a current account for safekeeping.

As for the profits taken before knowing of the prohibition, they are permissible for their owner, based on the Almighty's saying: ﴿So whoever receives an admonition from his Lord and desists, he may have what has already passed.﴾ Therefore, the money must be transferred to a current account immediately.