Romans 12:17-20

If someone does wrong to you, do not pay him back by doing wrong to him. Try to do what everyone thinks is right. Do your best to live in peace with everyone. My friends, do not try to punish others when they wrong you, but wait for God to punish them with his anger. It is written: “I will punish those who do wrong; I will repay them,” says the Lord. But you should do this: “If your enemy is hungry, feed him; if he is thirsty, give him a drink. Doing this will be like pouring burning coals on his head.”