How to resign from work and retrieve passport if the visa is in process

Hi Sir,

I am M. J. I worked in typing center as a cashier last two months, and there was a problem with cash every day.

So I decided to resign. Now my visa is under process, it is done and my status is changed, I didn't do medical and class.

Now my employer didn't give me the passport. He told me to clear the cash and take my passport. What can I do?

Please help me