What is the ruling on current accounts in interest-based banks from which no interest is taken, and on guarantees issued by banks for a fee and the reservation of a portion of the balance, and what is a beneficial book on Islamic financial transactions?

The work of a usurious bank is based on lending and borrowing with interest, and this is the usury forbidden by the Qur’an, the Sunnah (definition), and scholarly consensus. Placing money in these banks without taking interest is considered aiding them in their forbidden usurious work, based on the Almighty’s saying: ﴿And do not cooperate in sin and aggression.﴾