Romans 12:19-21
v19. do not take revenge, my dear friends, but leave room for God's wrath, for it is written: "it is mine to avenge; i will repay," says the Lord
v20. on the contrary: "if your enemy is hungry, feed him; if he is thirsty, give him something to drink. in doing this, you will heap burning coals on his head."
v21. do not be overcome by evil, but overcome evil with good.