Working for a bank

Ribaa (interest) and any involvement in interest has been severely condemned in the Hadith. Below are some of the Ahaadith that are reported in regard to the grave sin of riba:

Hadhrat Jaabir (Radiallahu Anhu) reports that Rasulullah (Sallallahu Alaihi Wasallam) cursed the one who consumes ribaa (interest), or feeds it to others, the one who records it (i.e. the transaction) and those who are witness to it (i.e. the transaction). And he said: “All of them are equal (in sin)”.

Hadhrat Abu Hurairah (Radiallahu Anhu) mentions that Rasulullah (Sallallahu Alaihi Wasallam) said: “A time will definitely dawn upon the ummah when everyone will consume interest. If someone does not consume it (interest), the evil effects will definitely affect him.”

Hadhrat Abdullah ibnu Hanzalah (Radiallahu Anhu) narrates that Rasulullah (Sallallahu Alaihi Wasallam) said: “If a person knowingly deals in one dirham of interest, it is worse than committing adultery thirty six times”.

You should sincerely repent to Allah Ta'ala for the impermissible employment that you are involved in and look for another source of livelihood.

And Allah Ta'ala (الله تعالى) knows best.