The ruling of whoever works in the Banks due to Ignorance and then he repents, and the ruling on the Wages that he took from them

Question :

I inform you that I used to work in one of the banks and it is called the Saudi-Holland Bank. It is one of the banks that are widespread throughout Saudi Arabia. I worked at this bank starting from a year after my graduation from high school and for a period of 6 or 7 months. Then, one of my friends informed me that working in the bank was forbidden since it dealt with Riba in some of its accounts. Therefore, I joined Saudi Airlines as a student and I left the bank. What I would like to ask is concerning the wages that I received during the 7 months, were they forbidden since I only worked as an employee, and I would take a salary for my work and my effort? Am I required to give all of what I received before of wages and monies in charity, or is it sufficient that I quit working at the bank?

Answer:

If the matter is as you mentioned, that after you were informed that it was not permissible to work in the bank (you quit), there is no sin on you for what you took from the bank in return for your work there for the mentioned period of months. You are not required to give it away in charity. It suffices that you made repentance from that. May Allâh pardon you and us. And success comes from Allâh. May Allâh send blessings and peace upon His servant and Messenger, Muham- mad, and upon his family and his Companions.

Source:
The Permanent Committee
Fatawa Islamiyah, Vol. 3 Page 393