Leviticus 24:17-20

And he that smiteth any man mortally shall surely be put to death.

And he that smiteth a beast mortally shall make it good, life for life.

And if a man cause a blemish in his neighbor; as he hath done, so shall it be done to him:

breach for breach, eye for eye, tooth for tooth; as he hath caused a blemish in a man, so shall it be rendered unto him.