“Dearly beloved, avenge not yourselves, but rather give place unto wrath: for it is written, Vengeance is mine; I will repay, saith the Lord.” (Romans 12:19) (KJV 1900)
39.33 ἐκδικέωb; ἐκδίκησιςb, εως f: to repay harm with harm, on the assumption that the initial harm was unjustified and that retribution is therefore called for—‘to pay back, to revenge, to seek retribution, retribution, seeking retribution.’
Louw, J. P., & Nida, E. A. (1996). Greek-English lexicon of the New Testament: based on semantic domains (electronic ed. of the 2nd edition., Vol. 1, p. 495). New York: United Bible Societies.