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In the Book of Genesis, God says to Cain after he slays his brother that anyone who kills the surviving sibling will be subject to “sevenfold” vengeance (“shivatayim yukam”). The classical biblical commentators offer various opinions on what the word (pronounced shee-va-TA-yeem) means: Perhaps revenge will be taken after seven (“sheva” or “shiv’ah”) generations, or perhaps the vengeance will be seven times as...