Romans 12:17-20

If someone has done you wrong, do not repay him with a wrong. Try to do what everyone considers to be good. Do everything possible on your part to live in peace with everybody. Never take revenge, my friends, but instead let God's anger do it. For the scripture says, “I will take revenge, I will pay back, says the Lord.” Instead, as the scripture says: “If your enemies are hungry, feed them; if they are thirsty, give them a drink; for by doing this you will make them burn with shame.”