"But if there is serious injury, you are to take life for life, eye for eye, tooth for tooth, hand for hand, foot for foot, burn for burn, wound for wound, bruise for bruise." - Exodus 21:23-25
"Anyone who injures their neighbor is to be injured in the same manner: fracture for fracture, eye for eye, tooth for tooth. The one who has inflicted the injury must suffer the same injury."
Do not repay anyone evil for evil. Be careful to do what is right in the eyes of everyone. If it is possible, as far as it depends on you, live at peace with everyone. 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. (Rom 12:17-19)
"What is meant by 'love'? This is clarified by what follows. One is to pray for enemies and do good to them and greet them. Clearly Jesus is not talking about emotions ...
"but instead is speaking of actions that benefit others. He is not dictating to our fickle feelings but commanding what can be commanded - our will to do this rather than that." - Dale Allison