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https://en.wikipedia.org/wiki/Eye_for_an_eye

"An eye for an eye" (Biblical Hebrew: עַיִן תַּחַת עַיִן‎, Ain takhat ain) is a commandment found in Exodus 21:23–27 expressing the principle of reciprocal justice measure for measure. In Roman civilization, the law of retaliation (Latin: lex talionis) bears the same principle that a person who has injured another person is to be penalized to a similar degree by the injured party. In softer interpretations, it means the victim receives the [estimated] value of the injury in compensation. The intent behind the principle was to restrict compensation to the value of the loss.

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