Genesis

And God said, Let us make man in our image, after our likeness: and let them have dominion over the fish of the sea, and over the fowl of the air, and over the cattle, and over all the earth, and over every creeping thing that creepeth upon the earth.

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

Then said Jesus unto him, Put up again thy sword into his place: for all they that take the sword shall perish with the sword.

Thou shalt not kill.