ISB ~ Romans 12 v19

Vengeance is mine:Reads like a translation of the i Aramaic Targum Neofiti at Deut 32:35. It is also possible that Paul has combined the wording of the Hebrew (“Vengeance is mine”) and Greek versions (“I will repay”) of this passage.

• God promised through Moses to avenge his enemies and vindicate the faithful. Paul takes this as a prohibition against private retaliation. Christians must recognize that God overlooks no evil or wrongdoing but will exact justice on the Day of Judgment. Our duty is to extend mercy to our enemies as Jesus did (Lk_23:34). See note on Mt 5:38.