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daf bit: Niddah 17
The rabbis are discussing bad traits and dangerous activities.
R. Shimon b. Yochai said: the following things cause a man who does them
to forfeit his life and his blood is upon his own head: eating peeled
garlic, onions, or eggs or drinking diluted liquids, if any of them were
kept overnight; spending a night in a graveyard; cutting his nails and
throwing them away in a public thoroughfare (and some others). For the
garlic etc, this is because an evil spirit might descend upon them, but
it's ok if they're stored with their peels. The graveyard: because he
might be exposed to danger. And the nails: because a pregnant woman
passing over them would miscarry, but this applies only if he used scissors.
(17a)
My edition doesn't further explain any of these. All cultures have superstitions; I guess these are some of the ones of this time.

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I suspect the danger is to more than just his life?
One possibility that came to mind is that a Jew caught spending the night in a graveyard would be likely to be accused of some variant of blood libel, thus endangering the community as well as himself. But that explanation wouldn't fit with the theme, here.
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