Who came up with the sentence "Get behind me Satan", and what does it mean?

I'm not an English native, so please elaborate a little. I've always assumed it's better to be able to stare your enemies in the face. Having them behind me rather scares me. (unless it's a naked Johnny Depp, but that's an entirely different topic. I don't even know why I mention... show more I'm not an English native, so please elaborate a little. I've always assumed it's better to be able to stare your enemies in the face. Having them behind me rather scares me. (unless it's a naked Johnny Depp, but that's an entirely different topic. I don't even know why I mention that)

So, please explain. Why do some people so desperately want Satan behind them?
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