On a side note: be VERY suspicious if you ever come across a situation, where person identified by a passport, does not keep (more exactly: control) it themselves. This is a big red flag you've encountered some sort of exploitative (and possibly illegal) situation. Please remember!

Quoting from my own passport:

"The bearer of this passport may pass it to a third party only if there is a statutory obligation to do so".

Denying the freedom of an employee to end a work relation with their employer & leave, does not pass that bar.