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What are the ramifications of this Pasuk?
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Ha'amek Davar: If a hater (who is never presumed Shogeg), lay in wait for the man he hates, in which case there was no warning, since we know for sure that he killed be'Meizid, 1 Beis-Din hand over the murderer to the Goel ha'Dam to kill.
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Ha'amek Davar: Otherwise, they would do nothing and let matters take their own course.