The money earned while not knowing that it is prohibited can be used. If you knew it was haram, you can only use what is necessary for you.

I was working for a bank, but now i have resigned and repented. Can i keep the money which i have earned and spend with leisure.

Riba | November 23, 2015 3:27 am
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There is something bothering me regarding the savings account in an undoubtedly pure Riba-based bank. I save my money because keeping it with me exposes the money to unnecessary spending & it is quite unsafe. I have even recently written to the manager to remove any interest attached to my account. Can I continue saving in this bank as a necessity?