Working in a riba-based (interest-based) bank
Question

                Aslamoaliakum.
I have been offered a job at a Bank, and I am not sure whether 
I should work there or not, because the bank makes money 
from interest (Riba). Please tell me whether working there is 
allowed (Jaaiz), or not.
jazaakum-Allah-khair.
Praise be to Allah.
You will find the answer in the hadeeth of Jaabir, may Allaah be pleased 
with him, who said: "The Messenger of Allaah cursed the one who 
consumes riba (interest or usury), the one who gives it, the one who writes 
it down and the one who witnesses it. He said: 'All of them are equal in 
sin.'" (Reported by Muslim, may Allaah have mercy on him, in his Saheeh, no. 1598)
Commenting on this hadeeth, al-Nawawi, may Allaah have mercy on him, 
said: This is clearly a prohibition of the writing down or witnessing of a 
contract between the two parties involved in a riba-based deal. It also 
includes a prohibition of helping others to commit wrong acts. And Allaah 
knows best.
It is inevitable that the employee in a riba-based bank will play a part in riba 
dealings one way or another, even if he is just a security guard. Maybe 
Allaah will help you, my brother, if you are patient, to find halaal 
employment. (Interpretation of the meaning) " And whosoever fears 
Allaah and keeps his duty to Him, He will make a way for him to get out 
(from every difficulty)." [al-Talaaq 65:2]