c.1300, from Anglo-Fr. vengeaunce, O.Fr. vengeance "revenge," from vengier "take revenge," from L. vindicare "to set free, claim, avenge" (see vindicate).
"Vengeance is mine, ... saith the Lord. Therefore if thine enemy hunger, feed him; if he thirst, give him drink; for in so doing thou shalt heap coals of fire upon his head." [Paul to the Romans, xii:19-20]