Comment: Where does it say anything about revenge?

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Where does it say anything about revenge?

When a person is executed by the state, that person's life is taken away by man since men run the state. The "state" isn't some abstract entity. It's an institution run by men.

Jesus wasn't doing away with the state-sanctioned death penalty. If you read up in earlier parts of the chapter, you can see that the gospel that Jesus is preaching to the multitude was a Kingdom gospel (referring to His future Kingdom on Earth).

21 Ye have heard that it was said of them of old time, Thou shalt not kill; and whosoever shall kill shall be in danger of the judgment:

22 But I say unto you, That whosoever is angry with his brother without a cause shall be in danger of the judgment: and whosoever shall say to his brother, Raca, shall be in danger of the council: but whosoever shall say, Thou fool, shall be in danger of hell fire.

In the verses that you pasted, Jesus was telling the multitude of individuals on how they could become perfect, he wasn't trying to change the state. Plus, Genesis 9:6 wasn't a part of Old Testament, Hebrew Law, that was a command God gave to mankind in general.

The Apostle Paul in Acts 25:11 clearly did not oppose the death penalty when he said, "For if I be an offender, or have committed any thing worthy of death, I refuse not to die: but if there be none of these things whereof these accuse me, no man may deliver me unto them. I appeal unto Caesar."