Help? 401K?

So I worked at a place for a few months and when I left I had $1690 in my 401K - retirement. I wanted to cash it out, which would be $1000. I need that money to put a down payment on a new car which I need. Everyone's telling me that I shouldn't do it and to just roll it over to my new job retirement. 
Anyone have any idea what to do?  Is it really gonna pay to roll it over? Should I cash it out?
I know nothing about this kind of stuff haha

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