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an eye for an eye, a tooth for a tooth
Compensation or retribution that is (or should be) of an equal amount or degree to the injury or offense that was originally dealt. The saying comes from various passages in the Old Testament, including in Exodus, Leviticus, and Deuteronomy. I cannot be placated by paltry excuses of reparation! An eye for an eye, a tooth for a tooth; this I demand from all who have wronged me.