Gen 9:4-6

4Only, you shall not eat flesh with its life, that is, its blood.5For your own lifeblood I will surely require a reckoning: from every animal I will require it and from human beings, each one for the blood of another, I will require a reckoning for human life.6Whoever sheds the blood of a human, by a human shall that person's blood be shed; for in his own image God made humankind.